Xceed Grid for WinForms v4.3 Documentation
Welcome to Xceed Grid for WinForms v4.3 / Basic Concepts / Input Validator control / Setting Up Validation Expressions Visually / Error Messages
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    Error Messages
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    Validation error messages represent the main way of signalling that an invalid value has been used in an input component. When an end-user enters an invalid value, an error message appears in a tooltip when the mouse hovers over an error icon displayed next to the input component. 

    There are two types of error messages: default and custom. Custom error messages are defined for specific criteria and override the default error message. When no custom error message is defined for a criterion, the default is used.