[Browsable(false)]
public int DataRowCount { get; }

<Browsable(False)>
Public ReadOnly Property DataRowCount As Integer

private void UpdatePrice(DevExpress.XtraGrid.Views.Base.ColumnView View) {
   // Obtain the Price column. 
   DevExpress.XtraGrid.Columns.GridColumn col = View.Columns.ColumnByFieldName("Price");
   if (col == null) return;
   View.BeginSort();
   try {
      // Obtain the number of data rows. 
      int dataRowCount = View.DataRowCount;
      // Traverse data rows and change the Price field values. 
      for (int i = 0; i < dataRowCount; i++) {
         object cellValue = View.GetRowCellValue(i, col);
         double newValue = Convert.ToDouble(cellValue) * 0.9;
         View.SetRowCellValue(i, col, newValue);
      }
   } finally { View.EndSort(); }
}

Private Sub UpdatePrice(ByVal View As DevExpress.XtraGrid.Views.Base.ColumnView)
   ' Obtain the Price column. 
   Dim Col As DevExpress.XtraGrid.Columns.GridColumn = View.Columns.ColumnByFieldName("Price")
   If Col Is Nothing Then Exit Sub 
   View.BeginSort()
   Try 
      ' Obtain the number of data rows. 
      Dim DataRowCount As Integer = View.DataRowCount
      ' Traverse data rows and change the Price field values. 
      Dim I As Integer 
      For I = 0 To DataRowCount - 1
         Dim CellValue As Object = View.GetRowCellValue(I, Col)
         Dim NewValue As Double = Convert.ToDouble(CellValue) * 0.9
         View.SetRowCellValue(I, Col, NewValue)
      Next 
   Finally 
      View.EndSort()
   End Try 
End Sub

{
    if (customerToEdit != null && gridView1.DataRowCount > oldRowsCount)
    {

// slow:
for(int i = 0; i < _view.DataRowCount; i++)
    selection.Add(_view.GetRow(i));

}
for (int i = 0; i <gridView1.DataRowCount; i++)
{

GridColumn column = view.Columns[keyFieldName];
for(int i = 0; i < view.DataRowCount; i++)
    if(view.GetMasterRowExpanded(i))

if (focusedRowHandle < 0) focusedRowHandle = 0;
    if (focusedRowHandle >= view.DataRowCount) focusedRowHandle = view.DataRowCount - 1;
}

Private Sub gridView1_AsyncCompleted(ByVal sender As Object, ByVal e As EventArgs)
    If customerToEdit IsNot Nothing AndAlso gridView1.DataRowCount > oldRowsCount Then
        For i As Integer = 0 To gridView1.DataRowCount - 1

' slow:
For i As Integer = 0 To _view.DataRowCount - 1
    selection.Add(_view.GetRow(i))

Next i
For i As Integer = 0 To gridView1.DataRowCount - 1
    If result Is gridView1.GetRowCellValue(i, gridView1.Columns("CustomerID")).ToString() Then

Dim column As GridColumn = view.Columns(keyFieldName)
For i As Integer = 0 To view.DataRowCount - 1
    If view.GetMasterRowExpanded(i) Then list.Add(view.GetRowCellValue(i, column))

If focusedRowHandle < 0 Then focusedRowHandle = 0
    If focusedRowHandle >= view.DataRowCount Then focusedRowHandle = view.DataRowCount - 1
End If