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.

Sub Page_Load(ByVal Sender As Object, ByVal e As EventArgs)
    ' Obtain a UserControl object MyControl from the
    ' user control file TempControl_Samples1.ascx.vb
    Dim myControl1 As MyControl = CType(LoadControl("TempControl_Samples1.vb.ascx"), MyControl)
    Controls.Add(myControl1)
End Sub

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

.NET Framework

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

Other Resources