Lo puedes hacer con el evento ItemDatabound:
Ejemplo:
Cita: private void InitializeComponent()
{
this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler (this.DataGrid1_ItemDataBound);
...
}
..
..
private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.AlternatingItem ||
e.Item.ItemType == ListItemType.Item)
{
((ImageButton)e.Item.FindControl("ImgExtracto")).I mageUrl = Server.MapPath("images/" + e.Item.Cells[5].Text + ")";
}
}
Salu2