{"id":3187,"date":"2025-09-29T15:29:43","date_gmt":"2025-09-29T15:29:43","guid":{"rendered":"https:\/\/xceed.com\/?p=3187"},"modified":"2026-02-16T19:26:28","modified_gmt":"2026-02-16T19:26:28","slug":"whats-new-in-net-9-complete-release-guide","status":"publish","type":"post","link":"https:\/\/xceed.com\/fr\/blog\/all\/whats-new-in-net-9-complete-release-guide\/","title":{"rendered":"What\u2019s New in .NET 9: Complete Release Guide"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"3187\" class=\"elementor elementor-3187\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2991d137 e-flex e-con-boxed e-con e-parent\" data-id=\"2991d137\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4d33950 elementor-widget elementor-widget-text-editor\" data-id=\"4d33950\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The .NET 9 release guide is here to help you navigate the biggest changes in modern .NET development. From major performance leaps and unified cloud development to powerful diagnostics and security upgrades, .NET 9 transforms how teams build, deploy, and scale. In this guide, discover the most impactful features\u2014and see how Xceed components make your migration and modernization seamless.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-248f63f elementor-widget elementor-widget-heading\" data-id=\"248f63f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\"><h2 class=\"wp-block-heading\" style=\"--tw-scale-x: 1;--tw-scale-y: 1;--tw-pan-x:;--tw-pan-y:;--tw-pinch-zoom:;--tw-scroll-snap-strictness: proximity;--tw-gradient-from-position:;--tw-gradient-via-position:;--tw-gradient-to-position:;--tw-ordinal:;--tw-slashed-zero:;--tw-numeric-figure:;--tw-numeric-spacing:;--tw-numeric-fraction:;--tw-ring-inset:;--tw-ring-offset-width: 0px;--tw-ring-offset-color: #fff;--tw-ring-offset-shadow: 0 0 #0000;--tw-ring-shadow: 0 0 #0000;--tw-shadow: 0 0 #0000;--tw-shadow-colored: 0 0 #0000;--tw-blur:;--tw-brightness:;--tw-contrast:;--tw-grayscale:;--tw-hue-rotate:;--tw-invert:;--tw-saturate:;--tw-sepia:;--tw-drop-shadow:;--tw-backdrop-blur:;--tw-backdrop-brightness:;--tw-backdrop-contrast:;--tw-backdrop-grayscale:;--tw-backdrop-hue-rotate:;--tw-backdrop-invert:;--tw-backdrop-opacity:;--tw-backdrop-saturate:;--tw-backdrop-sepia:;--tw-contain-size:;--tw-contain-layout:;--tw-contain-paint:;--tw-contain-style:\">Why .NET 9 Matters for Developers<\/h2><div><br><\/div><p style=\"--tw-scale-x: 1;--tw-scale-y: 1;--tw-pan-x:;--tw-pan-y:;--tw-pinch-zoom:;--tw-scroll-snap-strictness: proximity;--tw-gradient-from-position:;--tw-gradient-via-position:;--tw-gradient-to-position:;--tw-ordinal:;--tw-slashed-zero:;--tw-numeric-figure:;--tw-numeric-spacing:;--tw-numeric-fraction:;--tw-ring-inset:;--tw-ring-offset-width: 0px;--tw-ring-offset-color: #fff;--tw-ring-offset-shadow: 0 0 #0000;--tw-ring-shadow: 0 0 #0000;--tw-shadow: 0 0 #0000;--tw-shadow-colored: 0 0 #0000;--tw-blur:;--tw-brightness:;--tw-contrast:;--tw-grayscale:;--tw-hue-rotate:;--tw-invert:;--tw-saturate:;--tw-sepia:;--tw-drop-shadow:;--tw-backdrop-blur:;--tw-backdrop-brightness:;--tw-backdrop-contrast:;--tw-backdrop-grayscale:;--tw-backdrop-hue-rotate:;--tw-backdrop-invert:;--tw-backdrop-opacity:;--tw-backdrop-saturate:;--tw-backdrop-sepia:;--tw-contain-size:;--tw-contain-layout:;--tw-contain-paint:;--tw-contain-style:\"><\/p><ul class=\"wp-block-list\" style=\"--tw-scale-x: 1;--tw-scale-y: 1;--tw-pan-x:;--tw-pan-y:;--tw-pinch-zoom:;--tw-scroll-snap-strictness: proximity;--tw-gradient-from-position:;--tw-gradient-via-position:;--tw-gradient-to-position:;--tw-ordinal:;--tw-slashed-zero:;--tw-numeric-figure:;--tw-numeric-spacing:;--tw-numeric-fraction:;--tw-ring-inset:;--tw-ring-offset-width: 0px;--tw-ring-offset-color: #fff;--tw-ring-offset-shadow: 0 0 #0000;--tw-ring-shadow: 0 0 #0000;--tw-shadow: 0 0 #0000;--tw-shadow-colored: 0 0 #0000;--tw-blur:;--tw-brightness:;--tw-contrast:;--tw-grayscale:;--tw-hue-rotate:;--tw-invert:;--tw-saturate:;--tw-sepia:;--tw-drop-shadow:;--tw-backdrop-blur:;--tw-backdrop-brightness:;--tw-backdrop-contrast:;--tw-backdrop-grayscale:;--tw-backdrop-hue-rotate:;--tw-backdrop-invert:;--tw-backdrop-opacity:;--tw-backdrop-saturate:;--tw-backdrop-sepia:;--tw-contain-size:;--tw-contain-layout:;--tw-contain-paint:;--tw-contain-style:\"><p style=\"--tw-scale-x: 1;--tw-scale-y: 1;--tw-pan-x:;--tw-pan-y:;--tw-pinch-zoom:;--tw-scroll-snap-strictness: proximity;--tw-gradient-from-position:;--tw-gradient-via-position:;--tw-gradient-to-position:;--tw-ordinal:;--tw-slashed-zero:;--tw-numeric-figure:;--tw-numeric-spacing:;--tw-numeric-fraction:;--tw-ring-inset:;--tw-ring-offset-width: 0px;--tw-ring-offset-color: #fff;--tw-ring-offset-shadow: 0 0 #0000;--tw-ring-shadow: 0 0 #0000;--tw-shadow: 0 0 #0000;--tw-shadow-colored: 0 0 #0000;--tw-blur:;--tw-brightness:;--tw-contrast:;--tw-grayscale:;--tw-hue-rotate:;--tw-invert:;--tw-saturate:;--tw-sepia:;--tw-drop-shadow:;--tw-backdrop-blur:;--tw-backdrop-brightness:;--tw-backdrop-contrast:;--tw-backdrop-grayscale:;--tw-backdrop-hue-rotate:;--tw-backdrop-invert:;--tw-backdrop-opacity:;--tw-backdrop-saturate:;--tw-backdrop-sepia:;--tw-contain-size:;--tw-contain-layout:;--tw-contain-paint:;--tw-contain-style:;font-size: medium;font-weight: 400\"><\/p><\/ul><\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-20c54cd9 elementor-widget elementor-widget-text-editor\" data-id=\"20c54cd9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul class=\"wp-block-list\">\n<li><strong>Performance Leap:<\/strong><br \/>CoreCLR optimizations, smarter JIT, and async IO make your apps faster and leaner, right out of the box.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul class=\"wp-block-list\">\n<li><strong>Unified Development:<\/strong><br \/>Web, desktop, and cloud platforms are more converged than ever\u2014one codebase, more reach.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul class=\"wp-block-list\">\n<li><strong>Tooling Upgrades:<\/strong><br \/>Visual Studio 2025 and CLI improvements streamline every stage of the dev lifecycle.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><\/p>\n<p><!-- \/wp:list --><!-- wp:heading {\"level\":3} --><\/p>\n<h3 class=\"wp-block-heading\">Key Features &amp; Enhancements<\/h3>\n<p><!-- \/wp:heading --><!-- wp:list --><\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul class=\"wp-block-list\"><!-- wp:list-item --><\/ul>\n<\/li>\n<\/ul>\n<p>\u00a0<\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul class=\"wp-block-list\">\n<li><strong>Hot Reload for Blazor &amp; WPF:<\/strong><br \/>Instantly update UIs without full rebuilds. Faster iteration = less friction, more productivity.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><!-- \/wp:list-item --><!-- wp:list-item --><\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul class=\"wp-block-list\">\n<li><strong>Async Virtualization:<\/strong><br \/>Enhanced support for large data sets\u2014ideal for real-time dashboards and Xceed DataGrid scenarios.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><!-- \/wp:list-item --><!-- wp:list-item --><\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul class=\"wp-block-list\">\n<li><strong>Cloud-Native APIs:<\/strong><br \/>Simplified Azure, AWS, and GCP integrations. Build and deploy serverless or containerized .NET apps with minimal friction.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><!-- \/wp:list-item --><!-- wp:list-item --><\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul class=\"wp-block-list\">\n<li><strong>Improved Diagnostics:<\/strong><br \/>Built-in memory profiling, thread analysis, and diagnostics UI help you catch performance issues early.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><!-- \/wp:list-item --><!-- wp:list-item --><\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul class=\"wp-block-list\">\n<li><strong>Security Hardening:<\/strong><br \/>New cryptography libraries, default HTTPS, and sandboxing\u2014especially critical for fintech, healthcare, and government projects.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><!-- \/wp:list-item --><\/p>\n<p><!-- \/wp:list --><!-- wp:heading {\"level\":3} --><\/p>\n<h3 class=\"wp-block-heading\">How .NET 9 Accelerates Xceed Component Value<\/h3>\n<p><!-- \/wp:heading --><!-- wp:list --><\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul class=\"wp-block-list\"><!-- wp:list-item --><\/ul>\n<\/li>\n<\/ul>\n<p>\u00a0<\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul class=\"wp-block-list\">\n<li><strong>WPF Toolkit &amp; DataGrid:<\/strong><br \/>Async data virtualization and new theming APIs mean smoother UX and easier integration with modern backends.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><!-- \/wp:list-item --><!-- wp:list-item --><\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul class=\"wp-block-list\">\n<li><strong>Zip for .NET &amp; Real-Time Zip:<\/strong><br \/>Async IO primitives deliver faster, more reliable compression for high-throughput workloads.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><!-- \/wp:list-item --><!-- wp:list-item --><\/p>\n<ul class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ul class=\"wp-block-list\">\n<li><strong>Pro Themes:<\/strong><br \/>Updated XAML styling hooks and accessibility improvements help you ship visually polished, compliant apps.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><!-- \/wp:list-item --><\/p>\n<p><!-- \/wp:list --><!-- wp:heading {\"level\":3} --><\/p>\n<h3 class=\"wp-block-heading\">Migration &amp; Best Practices<\/h3>\n<p><!-- \/wp:heading --><!-- wp:list {\"ordered\":true} --><\/p>\n<ol class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ol class=\"wp-block-list\"><!-- wp:list-item --><\/ol>\n<\/li>\n<\/ol>\n<p>\u00a0<\/p>\n<ol class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ol class=\"wp-block-list\">\n<li><strong>Audit Dependencies:<\/strong><br \/>Update NuGet packages and verify .NET 9 compatibility for all libraries, especially UI and file handling.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p><!-- \/wp:list-item --><!-- wp:list-item --><\/p>\n<ol class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ol class=\"wp-block-list\">\n<li><strong>Leverage Hot Reload:<\/strong><br \/>Integrate hot reload into your workflow for rapid UI iteration\u2014this is a game changer for onboarding and trial productivity.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p><!-- \/wp:list-item --><!-- wp:list-item --><\/p>\n<ol class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ol class=\"wp-block-list\">\n<li><strong>Profile Early:<\/strong><br \/>Use the new diagnostics tools to baseline performance and catch regressions before they reach production.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p><!-- \/wp:list-item --><!-- wp:list-item --><\/p>\n<ol class=\"wp-block-list\">\n<li style=\"list-style-type: none;\">\n<ol class=\"wp-block-list\">\n<li><strong>Stay Secure:<\/strong><br \/>Enable new security defaults and review API changes for compliance-critical projects.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n<p><!-- \/wp:list-item --><\/p>\n<p><!-- \/wp:list --><!-- wp:heading {\"level\":3} --><\/p>\n<h3 class=\"wp-block-heading\"><strong>Ready to Build with .NET 9?<\/strong><\/h3>\n<p><!-- \/wp:heading --><!-- wp:paragraph --><\/p>\n<p>Xceed\u2019s .NET components are fully compatible and optimized for .NET 9.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p><mark class=\"has-inline-color has-primary-color\" style=\"background-color: rgba(0, 0, 0, 0);\"><strong>Start your free 45-day trial:<\/strong><br \/><\/mark><a href=\"https:\/\/xceed.com\/fr\/proces\/\">https:\/\/xceed.com\/trial\/<\/a><\/p>\n<p><!-- \/wp:paragraph --><!-- wp:heading --><\/p>\n<h2 class=\"wp-block-heading\">FAQ: .NET 9 Release &amp; Xceed Compatibility<\/h2>\n<p><!-- \/wp:heading --><!-- wp:paragraph --><\/p>\n<p><mark class=\"has-inline-color has-primary-color\" style=\"background-color: rgba(0, 0, 0, 0);\"><strong>Q: Are Xceed components ready for .NET 9?<\/strong><br \/><\/mark>A: Yes. All major Xceed UI and file libraries are tested and optimized for .NET 9. Reach out if you need migration guidance.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p><mark class=\"has-inline-color has-primary-color\" style=\"background-color: rgba(0, 0, 0, 0);\"><strong>Q: Will my existing WPF projects upgrade smoothly?<\/strong><br \/><\/mark>A: In most cases, yes\u2014especially with updated dependencies. Review the migration checklist above and consult the <a href=\"https:\/\/xceed.com\/fr\/support\/\">Xceed Support Hub<\/a> if you hit issues.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p><mark class=\"has-inline-color has-primary-color\" style=\"background-color: rgba(0, 0, 0, 0);\"><strong>Q: Where can I find code samples and migration tutorials?<\/strong><br \/><\/mark>A: Check the Xceed Documentation Hub for step-by-step guides and real-world code samples tailored for .NET 9.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p><mark class=\"has-inline-color has-primary-color\" style=\"background-color: rgba(0, 0, 0, 0);\"><strong>Q: What\u2019s the main benefit of .NET 9 for enterprise teams?<\/strong><br \/><\/mark>A: Unified platform, faster performance, and easier cloud integration\u2014plus robust support for secure, scalable UI and file handling.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p><mark class=\"has-inline-color has-primary-color\" style=\"background-color: rgba(0, 0, 0, 0);\"><strong>Have more questions or need help upgrading?<\/strong><br \/><\/mark>Consultez notre <a href=\"https:\/\/xceed.com\/fr\/support\/\">Support Contact Page<\/a>\u2014our team is ready to help you unlock the full value of .NET 9.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p><!-- \/wp:paragraph --><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-294b116 e-flex e-con-boxed e-con e-parent\" data-id=\"294b116\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>.NET 9 is here\u2014and it\u2019s a major leap for modern .NET developers. This guide breaks down the most impactful features, why they matter, and how Xceed components help you get the most from this release.<\/p>","protected":false},"author":12,"featured_media":3189,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[141,52,50],"tags":[],"class_list":["post-3187","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-all","category-news","category-releases"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>.NET 9 Release Guide: What\u2019s New &amp; How Xceed Components Accelerate Your Apps<\/title>\n<meta name=\"description\" content=\"Explore the .NET 9 release guide for key features, performance upgrades, and best practices. Learn how Xceed components help you build faster, more secure apps.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/xceed.com\/fr\/blog\/liberations\/whats-new-in-net-9-complete-release-guide\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\".NET 9 Release Guide: What\u2019s New &amp; How Xceed Components Accelerate Your Apps\" \/>\n<meta property=\"og:description\" content=\"Explore the .NET 9 release guide for key features, performance upgrades, and best practices. Learn how Xceed components help you build faster, more secure apps.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/xceed.com\/fr\/blog\/liberations\/whats-new-in-net-9-complete-release-guide\/\" \/>\n<meta property=\"og:site_name\" content=\"Xceed\" \/>\n<meta property=\"article:published_time\" content=\"2025-09-29T15:29:43+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-16T19:26:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/xceed.com\/wp-content\/uploads\/2025\/09\/6.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Christopher Radford\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Christopher Radford\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/xceed.com\\\/blog\\\/releases\\\/whats-new-in-net-9-complete-release-guide\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/xceed.com\\\/blog\\\/releases\\\/whats-new-in-net-9-complete-release-guide\\\/\"},\"author\":{\"name\":\"Christopher Radford\",\"@id\":\"https:\\\/\\\/xceed.com\\\/fr\\\/#\\\/schema\\\/person\\\/79a6cce48b70a88e6701fef086d7c351\"},\"headline\":\"What\u2019s New in .NET 9: Complete Release Guide\",\"datePublished\":\"2025-09-29T15:29:43+00:00\",\"dateModified\":\"2026-02-16T19:26:28+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/xceed.com\\\/blog\\\/releases\\\/whats-new-in-net-9-complete-release-guide\\\/\"},\"wordCount\":517,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/xceed.com\\\/fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/xceed.com\\\/blog\\\/releases\\\/whats-new-in-net-9-complete-release-guide\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/xceed.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/6.png\",\"articleSection\":[\"All\",\"News\",\"Releases\"],\"inLanguage\":\"fr-CA\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/xceed.com\\\/blog\\\/releases\\\/whats-new-in-net-9-complete-release-guide\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/xceed.com\\\/blog\\\/releases\\\/whats-new-in-net-9-complete-release-guide\\\/\",\"url\":\"https:\\\/\\\/xceed.com\\\/blog\\\/releases\\\/whats-new-in-net-9-complete-release-guide\\\/\",\"name\":\".NET 9 Release Guide: What\u2019s New & How Xceed Components Accelerate Your Apps\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/xceed.com\\\/fr\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/xceed.com\\\/blog\\\/releases\\\/whats-new-in-net-9-complete-release-guide\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/xceed.com\\\/blog\\\/releases\\\/whats-new-in-net-9-complete-release-guide\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/xceed.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/6.png\",\"datePublished\":\"2025-09-29T15:29:43+00:00\",\"dateModified\":\"2026-02-16T19:26:28+00:00\",\"description\":\"Explore the .NET 9 release guide for key features, performance upgrades, and best practices. Learn how Xceed components help you build faster, more secure apps.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/xceed.com\\\/blog\\\/releases\\\/whats-new-in-net-9-complete-release-guide\\\/#breadcrumb\"},\"inLanguage\":\"fr-CA\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/xceed.com\\\/blog\\\/releases\\\/whats-new-in-net-9-complete-release-guide\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-CA\",\"@id\":\"https:\\\/\\\/xceed.com\\\/blog\\\/releases\\\/whats-new-in-net-9-complete-release-guide\\\/#primaryimage\",\"url\":\"https:\\\/\\\/xceed.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/6.png\",\"contentUrl\":\"https:\\\/\\\/xceed.com\\\/wp-content\\\/uploads\\\/2025\\\/09\\\/6.png\",\"width\":1280,\"height\":720,\"caption\":\"Xceed mascot surrounded by floating UI windows, stylized charts, and code snippets, highlighting .NET 9 release features.\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/xceed.com\\\/blog\\\/releases\\\/whats-new-in-net-9-complete-release-guide\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/xceed.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What\u2019s New in .NET 9: Complete Release Guide\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/xceed.com\\\/fr\\\/#website\",\"url\":\"https:\\\/\\\/xceed.com\\\/fr\\\/\",\"name\":\"Xceed\",\"description\":\"Provides tools for .NET, Windows Forms, WPF, Silverlight, and ASP.NET developers to create better applications.\",\"publisher\":{\"@id\":\"https:\\\/\\\/xceed.com\\\/fr\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/xceed.com\\\/fr\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-CA\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/xceed.com\\\/fr\\\/#organization\",\"name\":\"Xceed\",\"url\":\"https:\\\/\\\/xceed.com\\\/fr\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-CA\",\"@id\":\"https:\\\/\\\/xceed.com\\\/fr\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/xceed.com\\\/wp-content\\\/uploads\\\/2024\\\/04\\\/cropped-xceed-logo.png\",\"contentUrl\":\"https:\\\/\\\/xceed.com\\\/wp-content\\\/uploads\\\/2024\\\/04\\\/cropped-xceed-logo.png\",\"width\":609,\"height\":150,\"caption\":\"Xceed\"},\"image\":{\"@id\":\"https:\\\/\\\/xceed.com\\\/fr\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/xceed.com\\\/fr\\\/#\\\/schema\\\/person\\\/79a6cce48b70a88e6701fef086d7c351\",\"name\":\"Christopher Radford\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-CA\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/646a50aec7dd7187eab0ace3be81c465cdf54ce89b57357657f254b7cb1b996c?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/646a50aec7dd7187eab0ace3be81c465cdf54ce89b57357657f254b7cb1b996c?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/646a50aec7dd7187eab0ace3be81c465cdf54ce89b57357657f254b7cb1b996c?s=96&d=mm&r=g\",\"caption\":\"Christopher Radford\"},\"sameAs\":[\"http:\\\/\\\/www.localhost:10003\"],\"url\":\"https:\\\/\\\/xceed.com\\\/fr\\\/blog\\\/author\\\/radfordc\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":".NET 9 Release Guide: What\u2019s New & How Xceed Components Accelerate Your Apps","description":"Explore the .NET 9 release guide for key features, performance upgrades, and best practices. Learn how Xceed components help you build faster, more secure apps.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/xceed.com\/fr\/blog\/liberations\/whats-new-in-net-9-complete-release-guide\/","og_locale":"fr_CA","og_type":"article","og_title":".NET 9 Release Guide: What\u2019s New & How Xceed Components Accelerate Your Apps","og_description":"Explore the .NET 9 release guide for key features, performance upgrades, and best practices. Learn how Xceed components help you build faster, more secure apps.","og_url":"https:\/\/xceed.com\/fr\/blog\/liberations\/whats-new-in-net-9-complete-release-guide\/","og_site_name":"Xceed","article_published_time":"2025-09-29T15:29:43+00:00","article_modified_time":"2026-02-16T19:26:28+00:00","og_image":[{"width":1280,"height":720,"url":"https:\/\/xceed.com\/wp-content\/uploads\/2025\/09\/6.png","type":"image\/png"}],"author":"Christopher Radford","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Christopher Radford","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/xceed.com\/blog\/releases\/whats-new-in-net-9-complete-release-guide\/#article","isPartOf":{"@id":"https:\/\/xceed.com\/blog\/releases\/whats-new-in-net-9-complete-release-guide\/"},"author":{"name":"Christopher Radford","@id":"https:\/\/xceed.com\/fr\/#\/schema\/person\/79a6cce48b70a88e6701fef086d7c351"},"headline":"What\u2019s New in .NET 9: Complete Release Guide","datePublished":"2025-09-29T15:29:43+00:00","dateModified":"2026-02-16T19:26:28+00:00","mainEntityOfPage":{"@id":"https:\/\/xceed.com\/blog\/releases\/whats-new-in-net-9-complete-release-guide\/"},"wordCount":517,"commentCount":0,"publisher":{"@id":"https:\/\/xceed.com\/fr\/#organization"},"image":{"@id":"https:\/\/xceed.com\/blog\/releases\/whats-new-in-net-9-complete-release-guide\/#primaryimage"},"thumbnailUrl":"https:\/\/xceed.com\/wp-content\/uploads\/2025\/09\/6.png","articleSection":["All","News","Releases"],"inLanguage":"fr-CA","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/xceed.com\/blog\/releases\/whats-new-in-net-9-complete-release-guide\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/xceed.com\/blog\/releases\/whats-new-in-net-9-complete-release-guide\/","url":"https:\/\/xceed.com\/blog\/releases\/whats-new-in-net-9-complete-release-guide\/","name":".NET 9 Release Guide: What\u2019s New & How Xceed Components Accelerate Your Apps","isPartOf":{"@id":"https:\/\/xceed.com\/fr\/#website"},"primaryImageOfPage":{"@id":"https:\/\/xceed.com\/blog\/releases\/whats-new-in-net-9-complete-release-guide\/#primaryimage"},"image":{"@id":"https:\/\/xceed.com\/blog\/releases\/whats-new-in-net-9-complete-release-guide\/#primaryimage"},"thumbnailUrl":"https:\/\/xceed.com\/wp-content\/uploads\/2025\/09\/6.png","datePublished":"2025-09-29T15:29:43+00:00","dateModified":"2026-02-16T19:26:28+00:00","description":"Explore the .NET 9 release guide for key features, performance upgrades, and best practices. Learn how Xceed components help you build faster, more secure apps.","breadcrumb":{"@id":"https:\/\/xceed.com\/blog\/releases\/whats-new-in-net-9-complete-release-guide\/#breadcrumb"},"inLanguage":"fr-CA","potentialAction":[{"@type":"ReadAction","target":["https:\/\/xceed.com\/blog\/releases\/whats-new-in-net-9-complete-release-guide\/"]}]},{"@type":"ImageObject","inLanguage":"fr-CA","@id":"https:\/\/xceed.com\/blog\/releases\/whats-new-in-net-9-complete-release-guide\/#primaryimage","url":"https:\/\/xceed.com\/wp-content\/uploads\/2025\/09\/6.png","contentUrl":"https:\/\/xceed.com\/wp-content\/uploads\/2025\/09\/6.png","width":1280,"height":720,"caption":"Xceed mascot surrounded by floating UI windows, stylized charts, and code snippets, highlighting .NET 9 release features."},{"@type":"BreadcrumbList","@id":"https:\/\/xceed.com\/blog\/releases\/whats-new-in-net-9-complete-release-guide\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/xceed.com\/"},{"@type":"ListItem","position":2,"name":"What\u2019s New in .NET 9: Complete Release Guide"}]},{"@type":"WebSite","@id":"https:\/\/xceed.com\/fr\/#website","url":"https:\/\/xceed.com\/fr\/","name":"Xceed","description":"Fournit des outils aux d\u00e9veloppeurs .NET, Windows Forms, WPF, Silverlight et ASP.NET pour cr\u00e9er de meilleures applications.","publisher":{"@id":"https:\/\/xceed.com\/fr\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/xceed.com\/fr\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-CA"},{"@type":"Organization","@id":"https:\/\/xceed.com\/fr\/#organization","name":"Xceed","url":"https:\/\/xceed.com\/fr\/","logo":{"@type":"ImageObject","inLanguage":"fr-CA","@id":"https:\/\/xceed.com\/fr\/#\/schema\/logo\/image\/","url":"https:\/\/xceed.com\/wp-content\/uploads\/2024\/04\/cropped-xceed-logo.png","contentUrl":"https:\/\/xceed.com\/wp-content\/uploads\/2024\/04\/cropped-xceed-logo.png","width":609,"height":150,"caption":"Xceed"},"image":{"@id":"https:\/\/xceed.com\/fr\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/xceed.com\/fr\/#\/schema\/person\/79a6cce48b70a88e6701fef086d7c351","name":"Christopher Radford","image":{"@type":"ImageObject","inLanguage":"fr-CA","@id":"https:\/\/secure.gravatar.com\/avatar\/646a50aec7dd7187eab0ace3be81c465cdf54ce89b57357657f254b7cb1b996c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/646a50aec7dd7187eab0ace3be81c465cdf54ce89b57357657f254b7cb1b996c?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/646a50aec7dd7187eab0ace3be81c465cdf54ce89b57357657f254b7cb1b996c?s=96&d=mm&r=g","caption":"Christopher Radford"},"sameAs":["http:\/\/www.localhost:10003"],"url":"https:\/\/xceed.com\/fr\/blog\/author\/radfordc\/"}]}},"_links":{"self":[{"href":"https:\/\/xceed.com\/fr\/wp-json\/wp\/v2\/posts\/3187","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xceed.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xceed.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xceed.com\/fr\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/xceed.com\/fr\/wp-json\/wp\/v2\/comments?post=3187"}],"version-history":[{"count":0,"href":"https:\/\/xceed.com\/fr\/wp-json\/wp\/v2\/posts\/3187\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xceed.com\/fr\/wp-json\/wp\/v2\/media\/3189"}],"wp:attachment":[{"href":"https:\/\/xceed.com\/fr\/wp-json\/wp\/v2\/media?parent=3187"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xceed.com\/fr\/wp-json\/wp\/v2\/categories?post=3187"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xceed.com\/fr\/wp-json\/wp\/v2\/tags?post=3187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}