System.Net.Tests.HttpWebRequestTest.GetRequestStreamAsync_WriteAndDisposeRequestStreamThenOpenRequestStream_ThrowsArgumentException C# (CSharp) Method

        public async Task GetRequestStreamAsync_WriteAndDisposeRequestStreamThenOpenRequestStream_ThrowsArgumentException(Uri remoteServer)
        {
            HttpWebRequest request = WebRequest.CreateHttp(remoteServer);
            request.Method = HttpMethod.Post.Method;
            Stream requestStream;
            using (requestStream = await request.GetRequestStreamAsync())
            {
                requestStream.Write(_requestBodyBytes, 0, _requestBodyBytes.Length);
            }
            Assert.Throws<ArgumentException>(() =>
            {
                var sr = new StreamReader(requestStream);
            });
        }