private void grbSuchenW_Click(object sender, EventArgs e)
        {
            if (cmbSuchenIn.SelectedItem.ToString() == "Kundennummer")
            {
 
                 BSuchen= "KDNR";
 
            }    
            if (cmbSuchenIn.SelectedItem.ToString() == "Firma")
            {
                BSuchen = "Firma";
 
            }
 
            if (cmbSuchenIn.SelectedItem.ToString() == "ORt")
            {
                BSuchen = "Ort";
            }
 
                // Kommando absetzen 
                con.Open();
                string strSQL = "Select kdnr, anrede, firma, extra from" & _
                  "stammdaten where '" + BSuchen + "' = '" + txtBSuchen.Text + _
                  "'";