Response.Write is not completing output

hi
I have code that creates XML file when user clicks on button. I find that the end of the string is being omitted though. Please advise on this.
It works on windows 2003 but not 2012. The error came around when moving from 2003 to 2012.

       
Public Shared Sub saveToHardDrive(filename As String,
                                          Response As HttpResponse, _
                                          textToWriteToFile As String,
                                          fileExtension As String)
                'response to prompt user to save.
                Response.ClearContent()
                Response.ContentType = "text/plain"

                'replace spaces with %20, prevents IE replacing with _ underscores
                If HttpContext.Current.Request.UserAgent.Contains("MSIE 7.0") Then
                    filename = filename.Replace(" ", "%20")
                End If

                'add XML to filename
                If Not filename.EndsWith(fileExtension) Then
                    filename += fileExtension
                End If
                Response.AddHeader("Content-disposition", "attachment;filename=""" + filename + """")

                Response.Write(textToWriteToFile)


                Response.BufferOutput = True
                Response.Flush()
                Response.Close()
        End Sub

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rwallacejAsked:
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BlueYonderConnect With a Mentor Commented:
Check the version of .net framework in use on 2003 then make sure the version is installed on the 2012 server.  Also make sure the target framework is set as shown in http://msdn.microsoft.com/en-us/library/bb772098(v=vs.90).aspx.  The problem may be with framework 4.5 and new namespaces.
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rwallacejAuthor Commented:
probably is this, to be checked - ended up moving back to old server though
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