title: The following code to check if a file exists on a server does not work
body: <p>I found the following code to check if a file exists on a server, but is not working for me.  It tells me that "test1.tx" does not exist even though the file exists and its size is 498 bytes.
  If I try with Ftp.ListDirectory it tells me that the file does not exist.
  If I try with Ftp.GetFileSize it does not provide any results and the debugger's immediate gives me the following message: A first chance exception of type 'System.Net.WebException' occurred in System.dll.</p>
  
  <p>Using "request.UseBinary = true" does not make any difference.</p>
  
  <p>I have posted this same question at this link:  <a href="http://social.msdn.microsoft.com/Forums/en-US/ncl/thread/89e05cf3-189f-48b7-ba28-f93b1a9d44ae" rel="nofollow noreferrer">http://social.msdn.microsoft.com/Forums/en-US/ncl/thread/89e05cf3-189f-48b7-ba28-f93b1a9d44ae</a></p>
  
  <p>Could someone help me how to fix it?</p>
  
  <pre><code>   private void button1_Click(object sender, EventArgs e)
      {
          string ftpServerIP = txtIPaddress.Text.Trim();
          string ftpUserID = txtUsername.Text.Trim();
          string ftpPassword = txtPassword.Text.Trim();
  
          try
          {
              FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://" + ftpServerIP + "//tmp/test1.txt");
              request.Method = WebRequestMethods.Ftp.ListDirectory;
              //request.Method = WebRequestMethods.Ftp.GetFileSize;
              request.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
              //request.UseBinary = true;
  
              using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
              {
                  // Okay.
                  textBox1.AppendText(Environment.NewLine);
                  textBox1.AppendText("File exist");
              }
          }
          catch (WebException ex)
          {
              if (ex.Response != null)
              {
                  FtpWebResponse response = (FtpWebResponse)ex.Response;
                  if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)
                  {
                      // Directory not found. 
                      textBox1.AppendText(Environment.NewLine);
                      textBox1.AppendText("File does not exist");
                  }
              }
          }
      }
  </code></pre>
  
  <p>Thanks very much,
  xplorer2k</p>