Reset the _receiveData variable on HttpClientExecute; otherwise, a second execution on the same HttpClient instance may read the previous content.

Author: claudiamurialdo

dotnet/src/dotnetframework/GxClasses/Domain/GxHttpClient.cs

@@ -792,6 +792,7 @@ internal void ProcessResponse(HttpResponseMessage httpResponse)
 		}
 		public void HttpClientExecute(string method, string name)
 		{
+			_receiveData = null;
 			_response = null;
 			Byte[] Buffer = new Byte[1024];
 			_errCode = 0;