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Button.IPostBackEventHandler.RaisePostBackEvent Method

Raises events for the Button control when it posts back to the server.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

void IPostBackEventHandler.RaisePostBackEvent(
	string eventArgument
)

Parameters

eventArgument
Type: System.String

The argument for the event.

Implements

IPostBackEventHandler.RaisePostBackEvent(String)

This event is used internally by the Button control, when it is clicked, to raise a Click event, and if defined, a Command event.

The following code example demonstrates how to override the IPostBackEventHandler.RaisePostBackEvent method so that it always raises the OnClick event in a custom Button control.

namespace Samples.AspNet.CS.Controls
{
  [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]
  public class CustomButtonRaisePostBackEvent : System.Web.UI.WebControls.Button, System.Web.UI.IPostBackEventHandler
  {
    private string message = System.String.Empty;

    protected override void Render(System.Web.UI.HtmlTextWriter writer) 
    {
      // Render a HTML submit button.
      writer.Write("<INPUT TYPE='submit' name='" + this.UniqueID + "' value='Click Me' />"); 
      writer.Write("<BR>" + message);
    }

    // Re-implement the IPostBackEventHandler's RaisePostBackEvent method. 
    // Note: C# allows this, where VB.NET does not. 
    public void RaisePostBackEvent(System.String eventArgument)
    {
      // Raise the Click event of the custom Button web control.
      OnClick(new System.EventArgs());

      // Don't call the Page.Validate or OnCommand events, 
      // which the base IPostBackEventHandler's RaisePostBackEvent method does.
    }

    protected override void OnClick(System.EventArgs e)
    {
      message = "RaisePostBackEvent method successful!";
    }
  }
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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