yes i know how to override the property but it is only dll there is no code my obviously we can make changes in it is there any posiblity to place any div or pannel some thing transparent on it while designing it??
You need to create a ASPX page which reads data from database and send response with image content type. Assume it's name is ShowImage.aspx. In your datalist, put template columns and specify the image tag like
If you have to pass additional values to ShowImage.aspx, pass it through query string.