.NET Framework Class Library
Control..::.OnInit Method

Updated: April 2009

Raises the Init event.

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

Visual Basic (Declaration)
Protected Friend Overridable Sub OnInit ( _
    e As EventArgs _
)
Visual Basic (Usage)
Dim e As EventArgs

Me.OnInit(e)
C#
protected internal virtual void OnInit(
    EventArgs e
)
Visual C++
protected public:
virtual void OnInit(
    EventArgs^ e
)
JScript
protected internal function OnInit(
    e : EventArgs
)

Parameters

e
Type: System..::.EventArgs
An EventArgs object that contains the event data.
Remarks

ASP.NET calls this method in order to raise the Init event. If you are developing a custom control, you can override this method in order to provide additional processing. If you override this method, you typically call the base control's OnInit method. If the base control's OnInit method is not called, subscribers to the event will not be notified.

Examples

Visual Basic
' Override the OnInit method to write text to the 
' containing page if the _text property is null.
      <System.Security.Permissions.PermissionSetAttribute( _
    System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _       
Protected Overrides Sub OnInit(e As EventArgs)
   MyBase.OnInit(e)
   If _text Is Nothing Then
      _text = "Here is some default text."
   End If
End Sub 'OnInit
C#
// Override the OnInit method to write text to the 
// containing page if the _text property is null.
[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")] 
protected override void OnInit(EventArgs e)
{
   base.OnInit(e);
   if ( _text == null)
        _text = "Here is some default text.";
}
Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Version Information

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
See Also

Reference

Other Resources

Change History

Date

History

Reason

April 2009

Revised Remarks section to clarify how the method is used.

Customer feedback.

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