title: upload only document files
body: <p>i am trying to upload documents .user can be able to upload theri documents but he/she can be upload images istead of documents and i want to d restrict about this how to apply condition this is my upload code </p>
  
  <pre><code>            if (FileUploadControl.PostedFile != null &amp;&amp; 
               FileUploadControl.PostedFile.ContentLength 
              &gt; 0)
          {
              if
                  (FileUploadControl.FileContent.Length &lt; 100000)
              {
                  string filename = 
                  Path.GetFileName(FileUploadControl.PostedFile.FileName);
                  string folder = Server.MapPath("~/Docfiles/");
                  Directory.CreateDirectory(folder);
                  FileUploadControl.PostedFile.SaveAs(Path.Combine(folder, filename));
                  try
                  {
                      cc.upload1(Txt_docde.Value, txt_dname.Value, 
                FileUploadControl.FileName, Convert.ToInt32(Docdrop.SelectedValue),
                         Convert.ToInt32(DropDownList2.SelectedValue), 
                Convert.ToString(Session["Login2"]),Convert.ToInt32(Session["UserID"]));
                      StatusLabel.ForeColor = System.Drawing.Color.Green;
                      //StatusLabel.ForeColor = System.Drawing.FontStyle.Bold;
                      StatusLabel.Text = "Success";
                  }
                  catch
                  {
                      StatusLabel.ForeColor = System.Drawing.Color.Red;
                      Label2.Text = "Failed";
  
  
                  }
              }
                  else
              {
                   StatusLabel.ForeColor = System.Drawing.Color.Red;
                              Label2.Text = "File Size to big";
              }
          }
  </code></pre>