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DefaultPropertyAttribute Class

Specifies the default property for a component.

Namespace:  System.ComponentModel
Assembly:  System (in System.dll)

public sealed class DefaultPropertyAttribute : Attribute

The following example defines a control named MyControl. The class is marked with a DefaultPropertyAttribute that specifies MyProperty as the default property.

 public class MyControl : Control {

    public int MyProperty {
       get {
          // Insert code here. 
          return 0;
       set {
          // Insert code here.

    // Insert any additional code.


The next example creates an instance of MyControl. Then it gets the attributes for the class, extracts the DefaultPropertyAttribute, and prints the name of the default property.

public static int Main() {
    // Creates a new control.
    MyControl myNewControl = new MyControl();

    // Gets the attributes for the collection.
    AttributeCollection attributes = TypeDescriptor.GetAttributes(myNewControl);

    /* Prints the name of the default property by retrieving the 
     * DefaultPropertyAttribute from the AttributeCollection. */
    DefaultPropertyAttribute myAttribute = 
    Console.WriteLine("The default property is: " + myAttribute.Name);

    return 0;


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0