document format problem, always get first document format

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C#

ASP.NET

i want to add document from my computer in c:\\CVFOLDERS.I added documets from my computer in c:\\CVFOLDERS. But i have a problem that if first document .jpg format then second document added jpg format.But actually second document pdf format. I didnt understand.
example i will 1.documet format file1.pdf 2.document format file2.png if firstly i add pdf format second document saved file2.pdf .

private void BindGrid(bool refreshDB)
       {
           _model = UserrModel.LoadModel();
           DSUserr dsUser = _model.GetDataSet();


           const int RESET_PAGE_INDEX = 0;
           if (refreshDB)
           {
               uwgUserr.Behaviors.Paging.PageIndex = RESET_PAGE_INDEX;

               _model.Refresh();
               divQuery.InnerHtml = _model.QuerySentence;

               dsUser = _model.GetDataSet();

               string cvPath = WebConfigurationManager.AppSettings["CV_PATH"];
               foreach (DSUserr.T_UserrRow rUserr in dsUserr.T_Userr)
               {
                   rUserr.DETAYLAR = string.Format"<input type=\"button\" value=\"Details\"  önclick=\"openDetaylar({0})\" class=\"gridButton\"/>", rUserr.Userr_NO);

                   string[] filename = Directory.GetFiles(cvPath, rUserr.Userr_NO + ".*");
                   if (filename.Length > 0)
                   {
                       rUserr.CV_1 = string.Format"<input type=\"button\" value=\"CV_1\"  önclick=\"openDetaylar({0})\" class=\"gridButton\"/>",Path.GetFileName(filename[0]));
                   }

               filename = Directory.GetFiles(cvPath,rUserr.Userr_NO + CV_original +".*");
                   if (filename.Length > 0)
                   {
                       rUserr.CV_2 = string.Format"<input type=\"button\" value=\"CV_2\"  önclick=\"openDetaylar({0})\" class=\"gridButton\"/>", Path.GetFileName(filename[0]));
                   }

                   
               }
           }
           uwgUserr.DataSource = dsUserr.T_Userr;
           uwgUserr.DataBind();
       }

[edit]Code block added - OriginalGriff[/edit]