StringBuilder sb = new StringBuilder();
foreach (string key in nvc.Keys)
{
sb.Append(boundary + "\r\n");
sb.Append("Content-Disposition: form-data; name=\"" + key + "\"\r\n");
sb.Append("\r\n");
sb.Append(nvc.Get(key) + "\r\n");
}
for (int i = 0; i < uploadfiles.Count; i++)
{
sb.Append("--");
sb.Append(boundary);
sb.Append("\r\n");
sb.Append("Content-Disposition: form-data; name=\"");
sb.Append("file"+(i+1));
sb.Append("\"; filename=\"");
sb.Append(System.IO.Path.GetFileName(uploadfiles[i]));
sb.Append("\"");
sb.Append("\r\n");
sb.Append("Content-Type: ");
sb.Append("image/jpeg");
sb.Append("\r\n");
sb.Append("\r\n");
\\картинка
}