alert message does not appear in create user wizard control in asp.net

Hi everyone, I am new to asp.net C#.
here is my code
MembershipCreateStatus status = new MembershipCreateStatus();                     string flag = status.ToString();                     if (flag == "Success")                     {                         string msg = "Success";                         ScriptManager.RegisterStartupScript(this, GetType(), "myalert", "alert('" + msg + &quo ...