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copied!<p>Building on dnolans example, this is the version I could actually get to work (there were some errors with the boundary, encoding wasn't set) :-)</p> <p>To send the data:</p> <pre><code>HttpWebRequest oRequest = null; oRequest = (HttpWebRequest)HttpWebRequest.Create("http://you.url.here"); oRequest.ContentType = "multipart/form-data; boundary=" + PostData.boundary; oRequest.Method = "POST"; PostData pData = new PostData(); Encoding encoding = Encoding.UTF8; Stream oStream = null; /* ... set the parameters, read files, etc. IE: pData.Params.Add(new PostDataParam("email", "example@example.com", PostDataParamType.Field)); pData.Params.Add(new PostDataParam("fileupload", "filename.txt", "filecontents" PostDataParamType.File)); */ byte[] buffer = encoding.GetBytes(pData.GetPostData()); oRequest.ContentLength = buffer.Length; oStream = oRequest.GetRequestStream(); oStream.Write(buffer, 0, buffer.Length); oStream.Close(); HttpWebResponse oResponse = (HttpWebResponse)oRequest.GetResponse(); </code></pre> <p>The PostData class should look like:</p> <pre><code>public class PostData { // Change this if you need to, not necessary public static string boundary = "AaB03x"; private List<PostDataParam> m_Params; public List<PostDataParam> Params { get { return m_Params; } set { m_Params = value; } } public PostData() { m_Params = new List<PostDataParam>(); } /// <summary> /// Returns the parameters array formatted for multi-part/form data /// </summary> /// <returns></returns> public string GetPostData() { StringBuilder sb = new StringBuilder(); foreach (PostDataParam p in m_Params) { sb.AppendLine("--" + boundary); if (p.Type == PostDataParamType.File) { sb.AppendLine(string.Format("Content-Disposition: file; name=\"{0}\"; filename=\"{1}\"", p.Name, p.FileName)); sb.AppendLine("Content-Type: application/octet-stream"); sb.AppendLine(); sb.AppendLine(p.Value); } else { sb.AppendLine(string.Format("Content-Disposition: form-data; name=\"{0}\"", p.Name)); sb.AppendLine(); sb.AppendLine(p.Value); } } sb.AppendLine("--" + boundary + "--"); return sb.ToString(); } } public enum PostDataParamType { Field, File } public class PostDataParam { public PostDataParam(string name, string value, PostDataParamType type) { Name = name; Value = value; Type = type; } public PostDataParam(string name, string filename, string value, PostDataParamType type) { Name = name; Value = value; FileName = filename; Type = type; } public string Name; public string FileName; public string Value; public PostDataParamType Type; } </code></pre>

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