Hello , I'm facing a problem when I try to list filenames in a report . I created a DLL that has a function for this purpose , but when I try generating the report it is shown the exception below: " ‘Textbox9.Paragraphs[11].TextRuns[0]’ contains an error: Request for the permission of type 'System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed." I've followed the steps described in : http://support.microsoft.com/kb/842419 and still have not succeeded . I'm using Windows XP and Reporting Services 2008 . Does anybody know how to do it? Thanks in advance, Monsao.