Preview Default image in Gridview

Try this Code:

protected void grdtest_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
Image imgCarPic = (Image)e.Row.FindControl("imgCarPic");
if (string.IsNullOrEmpty(imgCarPic.ImageUrl.ToString()))
{
imgCarPic.ImageUrl = "../images/NoImageSmall.jpg";
}
else
{
String strUploadedPicPath = Server.MapPath(imgCarPic.ImageUrl.ToString());
if (!System.IO.File.Exists(strUploadedPicPath))
{
imgCarPic.ImageUrl = "../images/NoImageSmall.jpg";
}
}
}
}

Good Luck