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OnPreRender Method

Control.OnPreRender Method

Raises the PreRender event.

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

protected internal virtual void OnPreRender(
	EventArgs e
)

Parameters

e
Type: System.EventArgs

An EventArgs object that contains the event data.

ASP.NET calls this method to raise the PreRender event. If you are developing a custom control, you can override this method in order to provide additional processing. If you override this method, call the base control's OnPreRender method to notify subscribers to the event.

// Override the OnPreRender method to set _message to 
// a default value if it is null. 
protected override void OnPreRender(EventArgs e)
{
    base.OnPreRender(e);
    if (_message == null)
        _message = "Here is some default text.";
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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