Hi,
You can use the ItemDataBound event of DataGrid to access cells width property before it is rendered.
private void DataGrid1OnItemBound(object sender, DataGridItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
e.Item.Cells[0].Width = 200;
}
}
HTH