1-) C# Athena -  DEVEXPRESS DATAGRİDE ROW EKLEME

DataTable dt = new DataTable();

            dt.Columns.Add("GUNCEL");

            dt.Columns.Add("AD");

            this.gridControl1.DataSource = dt;

            gridView1.AddNewRow();

            int rowHandle = gridView1.GetRowHandle(gridView1.DataRowCount);

            if (gridView1.IsNewItemRow(rowHandle)) {

                gridView1.SetRowCellValue(rowHandle, gridView1.Columns["GUNCEL"], "no");// yes no

                gridView1.SetRowCellValue(rowHandle, gridView1.Columns["AD"], "Neden Tanımı V.10 12/12/2017");

            }

1-) eğer bir alan integer ise yani numeric bu şekilde ekle

 dt.Columns["KACKATI"].DataType = System.Type.GetType("System.Decimal");

 this.gridControl1.DataSource = dt;