private void frmPartNumberList_Load(object sender, EventArgs e) { PartnumberCollection pnc = new PartnumberCollection(); DataTable dt = pnc.GeneratePartNumberCollection(); LoadPartNumbersFromFiles(); gridControl1.DataSource = dt; gridView1.Columns["Carmodel"].Group(); gridView1.Columns["Model"].Group(); gridView1.Columns["ECU type"].Group(); gridView1.BestFitColumns(); }