private void Checkin_TextBox_SearchCutomer_TextChanged(object sender, EventArgs e) { BS_Layer.BLCustomer bl = new BLCustomer(); var dtHD = new DataTable(); dtHD.Clear(); DataSet ds = new DataSet(); if (Checkin_Combobox_Search.Text == "Customer Name") { ds = bl.SearchCutomer(Checkin_TextBox_SearchCutomer.Text, null); } else { ds = bl.SearchCutomer(null, Checkin_TextBox_SearchCutomer.Text); } dtHD = ds.Tables[0]; Checkin_Datagridview_ListOfCustomer.DataSource = dtHD; }