سلام.

من از طریق کد زیر اطلاعات را از مشتری دریاف میکنم و و یه user تشکیل میدهم حالا میخوام از userid استفاده کنم خطا میده..

لطفا راهنمایی کنید

protected void Button1_Click(object sender, EventArgs e)
        {
           
            MembershipCreateStatus cstatus;
            MembershipUser ms = Membership.CreateUser(txtUserName.Text, txtPass.Text,"a @ gmail.com", "1", "1", true, out cstatus);

            switch (cstatus)
            {
                case MembershipCreateStatus.DuplicateEmail:
                 
                    break;
                case MembershipCreateStatus.DuplicateUserName:
                    lblMessage.Text = "نام کاربری تکراری میباشد";
                    break;
                case MembershipCreateStatus.InvalidAnswer:
                    break;
                case MembershipCreateStatus.InvalidEmail:
                 
                    break;
                case MembershipCreateStatus.InvalidPassword:
                   
                    break;
                case MembershipCreateStatus.InvalidProviderUserKey:
                    break;
                case MembershipCreateStatus.InvalidQuestion:
                    break;
                case MembershipCreateStatus.InvalidUserName:
                    break;
                case MembershipCreateStatus.ProviderError:
                    break;
                case MembershipCreateStatus.Success:
                    MembershipUser User = Membership.GetUser(txtUserName.Text);
                    CreateCutomer(User.ProviderUserKey.ToString());
                    break;
                case MembershipCreateStatus.UserRejected:
                    break;
                default:
                    break;



            }



        }




        private void CreateCutomer(string UserID)
        {


            tbDefine_CustomerAD _entity = new tbDefine_CustomerAD();
            CustomerADBLL _obj = new CustomerADBLL();
            _entity.fldName = txtName.Text;
            _entity.fldFamily = txtFamily.Text;
            _entity.fldNationalCode = txtNationalCode.Text;  
            _entity.fldAddress = txtAddress.Text;
            _entity.fldUserID = new Guid(UserID);
            if (_obj.insertCustomerAD(_entity))
                lblMessage.Text = "ok shod";
            else
                lblMessage.Text = "khata";



        }

و خطا هم به شکل زیره...