Multiple postbacks prevention

[virang_21]

Hi folks,

I am trying to prevent multiple postbacks from a button. When user clicks the button it becomes disabled but still i end up having multiple entries of same data in the database. Is anything wrong the way I am disabling my button ?

StringBuilder sbValid = new StringBuilder();

                sbValid.Append("if (typeof(Page_ClientValidate) == 'function') { ");

                sbValid.Append("if (Page_ClientValidate('RequiredFields') == false) { return false; }} ");

                sbValid.Append("this.value = 'Please wait...';");

                sbValid.Append("this.disabled = true;");

                //sbValid.Append("this.disabled = true;");

                //GetPostBackEventReference obtains a reference to a client-side script function that causes the server to post back to the page.

                sbValid.Append(this.Page.GetPostBackEventReference(this.btnSubmit));

                sbValid.Append(";");

                this.btnSubmit.Attributes.Add("onclick", sbValid.ToString());

RequiredFields is my validation group.