Are you sure in your code behind(somewhere like InitializeComponent() or even in your Page_Load)there is a line like this?
this.ImageButton1.Click += new System.Web.UI.ImageClickEventHandler(this.ImageBut ton1_Click);
and then are u sure ,according to above line you have below procedure?
private void ImageButton1_Click(object sender, System.Web.UI.ImageClickEventArgs e)
{
//...
}
change ImageButton1 to cmdLogoutASCX(for checking them).
HTH.
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Mehdi.
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