reportviewer and image issue

Hello.

I have an table with a field with the url of the image

I have put in source the value database, and in value with =Fields!image.Value (image is the url field), but i only get

<img onload="this.fitproportional=true;this.pv=0;this.ph=0;" height="58px" alt="This is an text" title="This is an text" src="">

when i use the view to see the rows, the field is correct, i.e., ~/images/110.png.

why in the reportviewer the src comes with ""

why? where is my error?

Thank's in advance

Marco Branco