What is your issue?? Kindly tell your issue clearly.. You want to show image on mouseover event??
If that is your question, then you can handle
rowDataBound Event to add
mouseover attributes to the rows and specify your ImageUrl Property there...
In rowDataBound Event,
if (e.Row.RowType == DataControlRowType.DataRow)
{
Image img = (Image)e.Row.FindControl("yourImageId");
img.Attributes.Add("onmouseover", "this.src='yourUrl'");
}