If the solution to this is already out there, then I apologize but I did some searching and could not find it.  We are using DNN 4.5.4 and I am developing a module in C#.  I have a problem with the following code:

                            string strUrl = NodeInfo.URL;
                            if (strUrl.ToLower().StartsWith("fileid="))
                            {
                                objFileInfo = objFileController.GetFileById(Int32.Parse(strUrl.Substring(7)), PortalId);
                                strUrl = objFileInfo.Folder + objFileInfo.FileName;
                            }
                            UrlControl.Url = strUrl;

If the NodeInfo.URL is something like 'FileID=1', everything works fine.  However, if the NodeInfo.URL is something like 'http://www.dotnetnuke.com' , the assignment will not work.  I have even tried doing a direct assignment via the immediate window in the VS IDE without success.  It just leaves 'http://' as the URL.  I also noted that if I delete 'http://' from the box, it will display the correct URL the next time I look at it.  Now, I am not a member of the Core team and my understanding of DNN is limited, but when I walked through the execution, I noticed the following code being executed in URLControl.vb [paraphrased for brevity]:

        Private Sub DoRenderTypeControls()
            Dim _Url As String = Convert.ToString(ViewState("Url"))
            Dim _Urltype As String = Convert.ToString(ViewState("UrlType"))
            Dim objUrls As New UrlController
            If _Urltype <> "" Then
                ' load listitems
                Select Case optType.SelectedItem.Value
                    Case "N"    ' None
      ...
                    Case "U"    ' Url
                        URLRow.Visible = True
                        TabRow.Visible = False
                        FileRow.Visible = False
                        UserRow.Visible = False

                        If txtUrl.Text = "" Then
                            txtUrl.Text = _Url
                        End If
                        If txtUrl.Text = "" Then
                            txtUrl.Text = "http://"
                        End If
                        txtUrl.Visible = True
      ...
                End Select
            Else
                URLRow.Visible = False
                TabRow.Visible = False
                FileRow.Visible = False
                UserRow.Visible = False
            End If
        End Sub

At the point noted in red, DNN had set the value to 'http://' and so the txtUrl.Text value was not set.  Is this intentional?

Any help would be appreciated!

The URL Control does have a problem with setting URLs on it.  You can set it OnInit and it'd work but for some reason setting it after OnLoad (Page_Load) doesn't seem to capture it.  I was so sick of it I wrote my own knock-off of that control to use instead.  It has a couple minor bugs but otherwise works great.  Can get it (free, no registration required) off my personal website: http://foober.homeip.net/Development/DotNetNukeModules/tabid/213/language/en-US/Default.aspx

One of these days I may revisit the control (by the way, it is a true control so you can add it to your VS toolbox) and make it work a lot better and function differently than the core URL control.  I don't care for the way it works.