Control.RenderControl Method (HtmlTextWriter)
Assembly: System.Web (in system.web.dll)
'Declaration Public Overridable Sub RenderControl ( _ writer As HtmlTextWriter _ ) 'Usage Dim instance As Control Dim writer As HtmlTextWriter instance.RenderControl(writer)
public void RenderControl ( HtmlTextWriter writer )
public function RenderControl ( writer : HtmlTextWriter )
Not applicable.
Parameters
- writer
The HTmlTextWriter object that receives the control content.
If a server control's Visible property is set to true, this method determines whether tracing is enabled for the page. If so, it stores trace information associated with the control, and renders the server control content to the page.
This method is automatically called by the page during the rendering, but can be overridden by custom control developers.
The following example overrides the RenderChildren method in a custom server control. It determines whether the current control has any child controls in its ControlCollection object. If it does, it uses the Count property to iterate through the collection. As it encounters each child control, it uses the RenderControl method to render the child control, and all of its child controls, to the containing page.
' Override default implementation to Render children according to needs. Protected Overrides Sub RenderChildren(output As HtmlTextWriter) If HasControls() Then ' Render Children in reverse order. Dim i As Integer For i = Controls.Count - 1 To 0 Step -1 Controls(i).RenderControl(output) Next End If End Sub 'RenderChildren Protected Overrides Sub Render(output As HtmlTextWriter) output.Write(("<br>Message from Control : " + Message)) output.Write(("Showing Custom controls created in reverse" + "order")) ' Render Controls. RenderChildren(output) End Sub End Class