Send Post request to upload file

[EDN Admin]

hi every one
i have created an application to post a file to my server (IIS 7, ASP.NET)
i have try many way but it do nothing. while no exception return
<pre class="prettyprint <form id="form1" runat="server" method="post" enctype="multipart/form-data
<input id="filMyFile" type="file" runat="server
<asp:button id="cmdSend" runat="server" Text="Send" onclick="cmdSend_Click"/>
</form>[/code]
this is the form of upload site. and the code for upload site (C#):
<pre class="prettyprint protected void cmdSend_Click(object sender, EventArgs e)
{
if (filMyFile.PostedFile != null)
{
HttpPostedFile myFile = filMyFile.PostedFile;
int nFileLen = myFile.ContentLength;

if (nFileLen > 0)
{
myFile.SaveAs("C:\temp\" + myFile.FileName);
}
}
}[/code]
I post it in browser ok, but when create post request using webrequest, nothing happend
here is the code:
<pre class="prettyprint public static string UploadFileEx(string uploadfile, string url, string fileFormName, string contenttype)
{
if ((fileFormName == null) ||
(fileFormName.Length == 0))
{
fileFormName = "file";
}

if ((contenttype == null) ||
(contenttype.Length == 0))
{
contenttype = "application/octet-stream";
}
Uri uri = new Uri(url);

string boundary = "----------" + DateTime.Now.Ticks.ToString("x");
HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(uri);
webrequest.ContentType = "multipart/form-data; boundary=" + boundary;
webrequest.Method = "POST";

StringBuilder sb = new StringBuilder();
sb.Append("--");
sb.Append(boundary);
sb.Append("rn");
sb.Append("Content-Disposition: form-data; name="");
sb.Append(fileFormName);
sb.Append(""; filename="");
sb.Append(Path.GetFileName(uploadfile));
sb.Append(""");
sb.Append("rn");
sb.Append("Content-Type: ");
sb.Append(contenttype);
sb.Append("rn");
sb.Append("rn");

string postHeader = sb.ToString();
byte[] postHeaderBytes = Encoding.UTF8.GetBytes(postHeader);

// Build the trailing boundary string as a byte array
// ensuring the boundary appears on a line by itself
byte[] boundaryBytes =
Encoding.ASCII.GetBytes("rn--" + boundary + "rn");

FileStream fileStream = new FileStream(uploadfile,
FileMode.Open, FileAccess.Read);
long length = postHeaderBytes.Length + fileStream.Length +
boundaryBytes.Length;
webrequest.ContentLength = length;

Stream requestStream = webrequest.GetRequestStream();

// Write out our post header
requestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);

// Write out the file contents
byte[] buffer = new Byte[checked((uint)Math.Min(4096,
(int)fileStream.Length))];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
requestStream.Write(buffer, 0, bytesRead);

// Write out the trailing boundary
requestStream.Write(boundaryBytes, 0, boundaryBytes.Length);
WebResponse responce = webrequest.GetResponse();
Stream s = responce.GetResponseStream();
StreamReader sr = new StreamReader(s);

return sr.ReadToEnd();
}[/code]
Please give me some direction to upload file
thanks

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