how to get value in combobox

  Mycombobox name = cmbsummary


private void cmbsummary_SelectedIndexChanged(object sender, EventArgs e)
        {
            string strQry;
            SqlConnection objConn = new SqlConnection(ConfigurationSettings.AppSettings["TrafficDB"]);
            strQry = "Select FileID ,Sitecode from   TBL_TXN_MAIN  order by Sitecode";
            SqlCommand objCmdVtype = new SqlCommand(strQry, objConn);
            SqlDataAdapter objDAVtype = new SqlDataAdapter(objCmdVtype);
            DataSet dsVtype = new DataSet();
            objDAVtype.Fill(dsVtype, "dtVtype");
            cmbsummary.DataSource = dsVtype.Tables["dtVtype"];
            cmbsummary.DisplayMember = "Sitecode";
            cmbsummary.ValueMember = "FileID";
            dsVtype.Dispose();
        }
          private void cmbtypesummary_click(object sender, EventArgs e)------Filling data in this code
        {
            string strQry;
            SqlConnection objConn = new SqlConnection(ConfigurationSettings.AppSettings["TrafficDB"]);
            strQry = "Select FileID ,Sitecode from   TBL_TXN_MAIN  order by Sitecode";
            SqlCommand objCmdVtype = new SqlCommand(strQry, objConn);
            SqlDataAdapter objDAVtype = new SqlDataAdapter(objCmdVtype);
            DataSet dsVtype = new DataSet();
            objDAVtype.Fill(dsVtype, "dtVtype");
            cmbtypesummary.DataSource = dsVtype.Tables["dtVtype"];
           cmbtypesummary.DisplayMember = "Sitecode";
           cmbtypesummary.ValueMember = "FileID";
            dsVtype.Dispose();
        }
       private void SiteSummary()---------- Sitesummary code
        {
            try
            {
                rpSiteSummary objRpt;
                objRpt = new rpSiteSummary();

                SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings["TrafficDB"]);

                String strQry = string.Empty;
                strQry = "Select Sitecode,count(1) Total from TBL_TXN_MAIN where Sitecode =(cmbsummary.text)group by Sitecode"; 
                 // Pls check  this query.  ..                                                                
                  
                SqlDataAdapter adapter = new SqlDataAdapter(strQry, myConnection);

                DataSet Ds = new DataSet();
                adapter.Fill(Ds, "DTSiteSummary");

                //if (Ds.Tables[0].Rows.Count == 0)
                //{
                //    return;
                //}

                objRpt.SetDataSource(Ds);

                frmReports reportsform = new frmReports();
                reportsform.crystalReportViewer.ReportSource = objRpt;
                reportsform.Show();
            }
            catch (Exception ex)
            {
            }