How do I Load Data From DataTable To DataGrid When Scrolling Down Row By Row

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WPF

private static List<datatable> SplitTable(DataTable originalTable, int batchSize)
{
List<datatable> tables = new List<datatable>();
int i = 0;
int j = 1;
DataTable newDt = originalTable.Clone();
newDt.TableName = "Table_" + j;
newDt.Clear();
foreach (DataRow row in originalTable.Rows)
{
DataRow newRow = newDt.NewRow();
newRow.ItemArray = row.ItemArray;
newDt.Rows.Add(newRow);
i++;
if (i == batchSize)
{
tables.Add(newDt);
j++;
newDt = originalTable.Clone();
newDt.TableName = "Table_" + j;
newDt.Clear();
i = 0;
}
}

{
           //MouseButton mb = (MouseButton)e.OriginalSource;
           //ScrollViewer sv = (ScrollViewer)e.OriginalSource;

           if ((SampleDatagrid.ScrollInfo.VerticalOffset) > 400) //commencted
               //Double d=e.(SampleDatagrid);
               if (((SampleDatagrid.Records.Count / 4) * 3) < SampleDatagrid.ScrollInfo.VerticalOffset) //commencted
               {
                   SampleDatagrid.DataSource = SystemDataHelpers.RowList(dt, 0, 300+Convert.ToInt32(SampleDatagrid.ScrollInfo.VerticalOffset));
                   Scrollcount = Scrollcount + 1;
                   scrollsize = scrollsize + 500;
                  fillDatagrid(ldtdt);
                   //SampleDatagrid.SelectionMode = System.Windows.Forms.DataGridViewSelectionMode.FullRowSelect;
                   //SplitTable(dt, size);
               }
       }

i am using Infragistics controls

{
          
           if ((SampleDatagrid.ScrollInfo.VerticalOffset) > 400) //commencted
               //Double d=e.(SampleDatagrid);
               if (((SampleDatagrid.Records.Count / 4) * 3) < SampleDatagrid.ScrollInfo.VerticalOffset) //commencted
               {
                   SampleDatagrid.DataSource = SystemDataHelpers.RowList(dt, 0, 300+Convert.ToInt32(SampleDatagrid.ScrollInfo.VerticalOffset));
                   Scrollcount = Scrollcount + 1;
                   scrollsize = scrollsize + 500;
                  fillDatagrid(ldtdt);
                  
               }
       }

SampleDatagrid.DataSource = dt.DefaultView;

I got Solution but my Scroll is going top when i load data

but i want to My scroll should stay there only