سلام ممنونم مشکل رو پیدا کردم  مشکل اصلی من از Query بود که در SelectedIndexChanged  گذاشته بودم ولی  وقتی کد های زیر رو قرار میدم خیلی کند میشه راهی وجود داره یا خیر 

string commandText1 = "select  SUM(isnull(opd,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt1 = new SqlCommand(commandText1, db.con);
            db.con.Open();
            lblopd.Text = dt1.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText2 = "select  SUM(isnull(lab,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt2 = new SqlCommand(commandText2, db.con);
            db.con.Open();
            lbllab.Text = dt2.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText3 = "select  SUM(isnull(endoc,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt3 = new SqlCommand(commandText3, db.con);
            db.con.Open();
            lblendos.Text = dt3.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText4 = "select  SUM(isnull(ultr,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt4 = new SqlCommand(commandText4, db.con);
            db.con.Open();
            lblultra.Text = dt4.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText5 = "select  SUM(isnull(dnc,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt5 = new SqlCommand(commandText5, db.con);
            db.con.Open();
            lbldnc.Text = dt5.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText6 = "select  SUM(isnull(gyn,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt6 = new SqlCommand(commandText6, db.con);
            db.con.Open();
            lblgyn.Text = dt6.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText7 = "select  SUM(isnull(dliver,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt7 = new SqlCommand(commandText7, db.con);
            db.con.Open();
            lbldeliver.Text = dt7.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText8 = "select  SUM(isnull(orth,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt8 = new SqlCommand(commandText8, db.con);
            db.con.Open();
            lblortho.Text = dt8.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText9 = "select  SUM(isnull(ambu,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt9 = new SqlCommand(commandText9, db.con);
            db.con.Open();
            lblambu.Text = dt9.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText10 = "select  SUM(isnull(echo,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt10 = new SqlCommand(commandText10, db.con);
            db.con.Open();
            lblecho.Text = dt10.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText11 = "select  SUM(isnull(xrdg,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt11 = new SqlCommand(commandText11, db.con);
            db.con.Open();
            lblxrydigi.Text = dt11.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText12 = "select  SUM(isnull(xrs,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt12 = new SqlCommand(commandText12, db.con);
            db.con.Open();
            lblxrys.Text = dt12.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText13 = "select  SUM(isnull(xrd,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt13 = new SqlCommand(commandText13, db.con);
            db.con.Open();
            lblxryd.Text = dt13.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText14 = "select  SUM(isnull(emg,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt14 = new SqlCommand(commandText14, db.con);
            db.con.Open();
            lblemerg.Text = dt14.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText15 = "select  SUM(isnull(ecg,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt15 = new SqlCommand(commandText15, db.con);
            db.con.Open();
            lblecg.Text = dt15.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText16 = "select  SUM(isnull(bed,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt16 = new SqlCommand(commandText16, db.con);
            db.con.Open();
            lblbed.Text = dt16.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText17 = "select  SUM(isnull(ot,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt17 = new SqlCommand(commandText17, db.con);
            db.con.Open();
            lblot.Text = dt17.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText18 = "select  SUM(isnull(pthrap,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt18 = new SqlCommand(commandText18, db.con);
            db.con.Open();
            lblptherap.Text = dt18.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText19 = "select  SUM(isnull(phar,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt19 = new SqlCommand(commandText19, db.con);
            db.con.Open();
            lblpharmacy.Text = dt19.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText20 = "select  SUM(isnull(dental,0)) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt20 = new SqlCommand(commandText20, db.con);
            db.con.Open();
            lbldental.Text = dt20.ExecuteScalar().ToString();
            db.con.Close();
 
            string commandText21 = "select  SUM(opd+lab+endoc+ultr+dnc+gyn+dliver+orth+ambu+echo+xrdg+xrs+xrd+emg+ecg+bed+ot+pthrap+phar+dental) as total from pfee where   PID = '" + lblpid.Text + "'";
            SqlCommand dt21 = new SqlCommand(commandText21, db.con);
            db.con.Open();
            lbltotal.Text = dt21.ExecuteScalar().ToString();
            db.con.Close();