System.Net.ProtocolViolationException: You must write ContentLength bytes to the request stream before calling [Begin]GetResponse

Question

I am getting the

\"System.Net.ProtocolViolationException: You must write ContentLength bytes to the request stream before calling [Begin]GetResponse\

Answer 1

Your code should work for .NET 2.0 From 4.0 and up you should close the stream after writing:

dataStream = Webrequest.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
datastream.Close();

Answer 2

This finally worked by using:

using (dataStream = Webrequest.GetRequestStream())
{
   dataStream.Write(byteArray, 0, byteArray.Length);
}

Instead of:

dataStream = Webrequest.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length); 

Answer 3

Check to verify that your server is set up to accept large files. You may find that you are running into the 4 meg default limit.

Add the following to your web.config file for larger file uploading:

<system.webServer>
    <security>
        <requestFiltering>
            <requestLimits maxAllowedContentLength="104857600" />
        </requestFiltering>
    </security>
</system.webServer>