[Alexasha]

Можно, в обработчике события Item_Databound. Пример:
protected void ImageRows_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
ImageEntity entity = (ImageEntity)e.Item.DataItem;
((Label)e.Item.FindControl("lbDescriptionValue")). Text = entity.Description;
if (all)
{
((System.Web.UI.WebControls.Image)e.Item.FindContr ol("image")).ImageUrl =
string.Format("~/ImageGenerator.ashx?id={0}", entity.ImageID);

}
else
{
((System.Web.UI.WebControls.Image)e.Item.FindContr ol("image")).ImageUrl = "~/Images/No Photo.jpg";
imageClientID = ((System.Web.UI.WebControls.Image)e.Item.FindContr ol("image")).ClientID;
}
}