ไม่สามารถ Update ได้ตามที่ต้องการ รบกวนช่วยหน่อยฮะ Web (ASP.NET) C#

protected void BTLogin_Click(object sender, EventArgs e)
    {
        connectdb();

        SqlCommand cmd = new SqlCommand("select * from Admin where Admin_Iden=@Admin_Iden and Admin_Password=@Admin_Password", conn);
        cmd.Parameters.AddWithValue("@Admin_Iden", TBIden.Text);
        cmd.Parameters.AddWithValue("@Admin_Password", TBPass.Text);
        SqlDataReader dr = cmd.ExecuteReader();

        if (dr.HasRows)
        {
            dr.Read();
            Session["AdminFName"] = dr["Admin_FName"].ToString();
            Session["AdminLName"] = dr["Admin_LName"].ToString();
            Session["AdminStatus"] = dr["Admin_StatusOwn"].ToString();
            WebLog_Admin();
         }
    }

protected void WebLog_Admin()
    {
        connectdb();

        SqlCommand cmd_admin = new SqlCommand("Insert into WebLog Values(@Admin_Iden,@Staff_Iden,@WebLog_TimeIn,@WebLog_TimeOut,@WebLog_StatusOwn)", conn);
        cmd_admin.Parameters.AddWithValue("@Admin_Iden", TBIden.Text);
        cmd_admin.Parameters.AddWithValue("@Staff_Iden", "-");
        cmd_admin.Parameters.AddWithValue("@WebLog_TimeIn", DateTime.Now);
        cmd_admin.Parameters.AddWithValue("@WebLog_TimeOut", "ยังไม่มีข้อมูลเข้ามา");
        cmd_admin.Parameters.AddWithValue("@WebLog_StatusOwn", Session["AdminStatus"].ToString());
        cmd_admin.ExecuteNonQuery();

        Session["Admin_Iden"] = TBIden.Text;        // โยน Session ไปอีกหน้า
        Response.Redirect("Main.aspx");
        }

protected void BTLogout_Click(object sender, EventArgs e)
    {
        if (LBStatus.Text == "ผู้ดูแลระบบ")
        {
            connectdb();

            SqlCommand cmd = new SqlCommand("Update WebLog Set WebLog_TimeOut=@WebLog_TimeOut Where WebLog.Admin_Iden=@Admin_Iden and WebLog_StatusOwn='ผู้ดูแลระบบ'", conn);
            cmd.Parameters.AddWithValue("@Admin_Iden", Session["Admin_Iden"].ToString());
            cmd.Parameters.AddWithValue("@WebLog_TimeOut", DateTime.Now);

            Session.Clear();
            Response.Redirect("Login.aspx");
         }
     }