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TemplateControl.LoadControl Method (String)

Loads a Control object from a file based on a specified virtual path.

Namespace: System.Web.UI
Assembly: System.Web (in system.web.dll)

public Control LoadControl (
	string virtualPath
)
public Control LoadControl (
	String virtualPath
)
public function LoadControl (
	virtualPath : String
) : Control
Not applicable.

Parameters

virtualPath

The virtual path to a control file.

Return Value

Returns the specified Control.

Exception typeCondition

ArgumentNullException

The virtual path is a null reference (Nothing in Visual Basic) or empty.

If the control supports caching, the object returned from the LoadControl method is not actually a Control object; rather, it is a PartialCachingControl object. If the virtualPath parameter is relative, the path of the loaded control is relative to the path of the TemplateControl.

When you load a control into a container control, the container raises all of the added control's events until it has caught up to the current event. However, the added control does not catch up with postback data processing. For an added control to participate in postback data processing, including validation, the control must be added in the Init event rather than in the Load event.

The following code example demonstrates how to use the LoadControl method to add a user control to an ASP.NET page.

In the OnInit event method, this page uses the LoadControl method to programmatically create a user control on the page. The method adds the control to the Controls property of a PlaceHolder Web server control named Placeholder1.

For the definition of the MyControl class that is used in this code example, see TemplateControl.

void Page_Init(object sender, System.EventArgs e)
{
    // Instantiate the UserControl object
    MyControl myControl1 =
        (MyControl)LoadControl("TempControl_Samples1.ascx.cs");
    PlaceHolder1.Controls.Add(myControl1);
}

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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