Answer to this question can be pretty complicated, because it depends on where your images repository sits. If the images are within the scope of your website it's wise to store a relative path to the image in your database as well and just render that relative path in a
tag
<img src="/Relative/DbPath.jpg" />
If your images are outside the scope of your website, you need to make sure that the folder the images are in, is readable to IIS. You can then open the image as a binary file and pass is through. This also depends on the type of ASP website you have, if you're using MVC it's even more easy, else you may want to add an ashx file to your project hand handle the image processing from there.
Your images will look like
<img src="/Image.ashx?databaseId=2" />
image.ashx must then open the actual file (fetch the path from the database and open the file with a stream and then pass the stream to the response object. Make sure you set the response type to the type of image you're about to pass.
Eduard