Is any way how I can show a image from my database on the form without creating additional files?

You can create a webform that pulls the binary data from the database based on some querystring data on the URL, then uses the Response.BinaryWrite() method to write the binary out to the response stream. This way you can have an image tag like this:

<img src="/myWebApp/image.aspx?imageID=12345">

-Peter