Disable Button OnClick
Description: Disables a asp.net button on postback
Link: http://www.codekeep.net/snippets/a01521f4-0f6e-475d-a8c5-85aaf0ed8779.aspx
btnBack.Attributes.Add("onclick", GetPostBackEventReference(btnBack) & ";this.value='Please wait...';this.disabled = true;")





