Unable to write data to the transport connection: an existing connection was forcibly closed by remote host

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C#

ASP.NET2

Hi all,

i am new at .net framework please help me to solve my issue

I am working with windows form with .net 2.0

while uploading less than 2MB file using 'web client' 'upload file' method it works file but uploading more than 2MB file it through exception Unable to write data to the transport connection: an existing connection was forcibly closed by remote host
i have read lots of forum but not works for my problem

I have iis5.1 for uploading file
this all i am doing on my local machine.

This is my code to upload file

private bool CreateNetcomFile(string ServerAddress, string docUniqueString)
        {
            string docName = path + "\\" + txtDocumentName.Text + "_" + docUniqueString;
            ZipInfo zip = new ZipInfo(path + "\\" + txtDocumentName.Text + ".zip");
            zip.PackFiles(null, objFiles, null);
            if (System.IO.File.Exists(zip.FullName))
            {
                System.IO.FileInfo objFile = new System.IO.FileInfo(zip.FullName);
                objFile.MoveTo(docName + ".netcom");
                System.Net.WebClient client = new System.Net.WebClient();

             try
              {
                 client.UploadFile(ServerAddress, "POST", docName + ".netcom");                  
              }
              catch (Exception ex)
             {
               MessageBox.Show(ex.Message);
             }
          }
        }

Thanks in advance every suggestion is appreciated.