The DefinitionKeyAttribute can be assigned to properties of your selected object to define which EditorDefinition to use for the decorated property. As an alternative to the Editor attribute, this allows you separate the UI-specific code from your business model code. It can also be used to specify a specific default editor when a property type does not resolve to a valid editor (e.g., Object).

[AttributeUsage(AttributeTargets.Property, 
   AllowMultiple=false, 
   Inherited=true)]
public class DefinitionKeyAttribute : System.Attribute 

'Declaration
 
<AttributeUsageAttribute(AttributeTargets.Property, 
   AllowMultiple=False, 
   Inherited=True)>
Public Class DefinitionKeyAttribute 
   Inherits System.Attribute

'Usage
 
Dim instance As DefinitionKeyAttribute

[DefinitionKey( "nameType" )]
public string FirstName { get; set; }

[DefinitionKey( "nameType" )]
public string LastName { get; set; }

[DefinitionKey( typeof( int? ) )]
public object ReferenceNo { get; set; }