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Page.RegisterRequiresPostBack Method

Registers a control as one that requires postback handling when the page is posted back to the server.

Namespace: System.Web.UI
Assembly: System.Web (in system.web.dll)
public void RegisterRequiresPostBack (
	Control control
)
public void RegisterRequiresPostBack (
	Control control
)
public function RegisterRequiresPostBack (
	control : Control
)
Not applicable.

Parameters

control

The control to be registered.

Exception typeCondition

HttpException

The control to register does not implement the IPostBackDataHandler interface.

The control to be registered must implement the IPostBackDataHandler interface or an HttpException is raised. When implemented by a control, the IPostBackDataHandler interface enables handling of post back data and raising of any post back data changed events. For more information on the server control event model, see ASP.NET Server Control Event Model.

Register controls with the page at or before the Page_PreRender event of the page life cycle.

The following code example uses the RegisterRequiresPostBack method to require a text box control, myTextBox, to be posted back before any code associated with the text box can execute. TextBox controls implement the IPostBackDataHandler interface.

Security noteSecurity Note:

This example has a text box that accepts user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see Script Exploits Overview (Visual Studio).

protected void Text_Change(object sender, EventArgs e)
{
  myLabel.Text = "<b>Welcome " + myTextBox.Text + " to ASP.NET</b>";
}

protected void Page_PreRender(object sender, EventArgs e)
{
  this.RegisterRequiresPostBack(myTextBox);
}

void Text_Change(Object sender, EventArgs e)
{
  myLabel.set_Text("<b>Welcome " + myTextBox.get_Text()
      + " to ASP.NET</b>");
}

void Page_Load(Object sender, EventArgs e)
{
  this.RegisterRequiresPostBack(myTextBox);
}

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0
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