private void btnB_Click(object sender, EventArgs e)
        {
            cboToExternal.Items.Clear();
            sqlInfoFetcher2 = new BackgroundWorker();
            sqlInfoFetcher2.DoWork += new DoWorkEventHandler(sqlInfoFetcher2_DoWork);
            sqlInfoFetcher2.RunWorkerCompleted += new RunWorkerCompletedEventHandler(sqlInfoFetcher2_RunWorkerCompleted);
            sqlInfoFetcher2.RunWorkerAsync();
        }



        void sqlInfoFetcher2_DoWork(object sender, DoWorkEventArgs e)
        {
            string connectionString = "Data Source=CLSUTER;Initial Catalog=Contacts;user id=sa;password=sa; Asynchronous Processing=true";
            string query = "SELECT DISTINCT First_Name + ' ' + Last_Name AS Expr1 FROM         dbo.NAME WHERE     (Last_Name LIKE 'B%')";
            e.Result = FetchDataFromDB(connectionString, query);
        }