FilenameMultipartFormDataStreamProvider.cs

public class FilenameMultipartFormDataStreamProvider : MultipartFormDataStreamProvider
{
        public FilenameMultipartFormDataStreamProvider(string path) : base(path)
        {
        }

        public override string GetLocalFileName(System.Net.Http.Headers.HttpContentHeaders headers)
        {
            var name = !string.IsNullOrWhiteSpace(headers.ContentDisposition.FileName) ? headers.ContentDisposition.FileName : Guid.NewGuid().ToString();
            return name.Replace("\"",string.Empty);
        }
}