UltraWinGrid Custom Merge User Logic

private void grdSlipSttlLst_InitializeLayout(object sender, InitializeLayoutEventArgs e)
        {
            //e.Layout.Override.MergedCellStyle = MergedCellStyle.Always;

            e.Layout.Bands[0].Columns["ArOrAp"].MergedCellStyle = MergedCellStyle.Always;
            e.Layout.Bands[0].Columns["CashCurrCd"].MergedCellStyle = MergedCellStyle.Always;
            e.Layout.Bands[0].Columns["DueDate"].MergedCellStyle = MergedCellStyle.Always;
            e.Layout.Bands[0].Columns["CashCurrCd"].MergedCellStyle = MergedCellStyle.Always;

            CustomMergedCellEvaluator customMergedCellEvaluator = new CustomMergedCellEvaluator();

            e.Layout.Bands[0].Columns["ArOrAp"].MergedCellEvaluator = customMergedCellEvaluator;
            e.Layout.Bands[0].Columns["CashCurrCd"].MergedCellEvaluator = customMergedCellEvaluator;
            e.Layout.Bands[0].Columns["DueDate"].MergedCellEvaluator = customMergedCellEvaluator;
            e.Layout.Bands[0].Columns["CashCurrCd"].MergedCellEvaluator = customMergedCellEvaluator;

        }


    public class CustomMergedCellEvaluator : Infragistics.Win.UltraWinGrid.IMergedCellEvaluator
    {
        public CustomMergedCellEvaluator()
        {

        }

        public bool ShouldCellsBeMerged(UltraGridRow row1, UltraGridRow row2, UltraGridColumn column)
        {
            if (row1.GetCellValue("CashPayNo").GetType().ToString() != "System.DBNull"
                && row2.GetCellValue("CashPayNo").GetType().ToString() != "System.DBNull"
                && row1.GetCellValue("CashPaySeq").GetType().ToString() != "System.DBNull"
                && row2.GetCellValue("CashPaySeq").GetType().ToString() != "System.DBNull")
            {

                string value1 = (string)row1.GetCellValue("CashPayNo");
                string value2 = (string)row2.GetCellValue("CashPayNo");

                string value3 = (string)row1.GetCellValue("CashPaySeq");
                string value4 = (string)row2.GetCellValue("CashPaySeq");

                return (value1+value3) == (value2+value4);
            }
            else return false;
        }

    }