NGWS SDK Documentation  

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ImageButton.PreRender

This method is invoked just prior to rendering. Register requires handling postback to determine if image has been clicked.

[Visual Basic]
Overrides Protected Sub PreRender()
[C#]
protected override void PreRender();
[C++]
protected: override void PreRender();
[JScript]
protected override function PreRender();

See Also

ImageButton Class | ImageButton Members | System.Web.UI.WebControls Namespace