Hi Alessandro,

To the first question, here is my answer: you should catch the url coming out of the urlControl and format it before storing it to the database. I resolved this way:

Dim ImageUrl As String = ""
Select Case MyUrlControl.UrlType
  Case "F"
    Dim ImageFileId As Integer = Integer.Parse(MyUrlControl.Url.Substring(7))
    Dim objFileController As New FileController
    Dim objImageInfo As DotNetNuke.Services.FileSystem.FileInfo = objFileController.GetFileById(ImageFileId, PortalId)
    ImageUrl = PortalSettings.HomeDirectory & objImageInfo.Folder & objImageInfo.FileName
  Case "U"
    ImageUrl = urlImage.Url
End Select

In addition, check this post:

http://forums.asp.net/p/873170/986848.aspx

Answering the second question, you can manage it in your control.ascx file with:

<dnn:URL ID="MyUrlControl" runat="server" FileFilter=".jpg,.gif"
            ShowFiles="true" ShowTrack="false" ShowLog="false" />

Hope it helps,

Dario Rossa.

FWIW, I know this is a bit of an older post but I just implemented this on my page and URLControl seems to not work with multiple values in the FileFilter when uploading. I'm on DNN 4.8.3 and couldn't upload a file with it until I had filefilter only showing 'jpg'. Which in my case is fine, but really just annoying to figure out.