protected void changepassBtn_Click(object sender, EventArgs e)
        {
            User   us       = (User)Session["user"];
            string oldpass  = OldPassTextBox.Text.ToString();
            string newpass  = NewPassTextBox.Text.ToString();
            string confpass = ConfirmPassTextBox.Text.ToString();

            string errorMsg = "";
            bool   success  = ChangePasswordController.validatePassword(us.UserID, oldpass, newpass, confpass, out errorMsg);

            if (!success)
            {
                labelError.Visible = true;
                labelError.Text    = errorMsg;
            }
            else
            {
                Response.Redirect("ViewProfile.aspx");
            }
        }