Use TotalMilliseconds instead of Milliseconds for equest timeouts. (#4663)

Fixes #4433

Author: StefanOssendorf

Source/Csla/DataPortalClient/HttpProxy.cs

@@ -265,12 +265,12 @@ protected override WebRequest GetWebRequest(Uri address)
         {
           if (readWriteTimeout > TimeSpan.Zero)
           {
-            httpWebRequest.ReadWriteTimeout = readWriteTimeout.Milliseconds;
+            httpWebRequest.ReadWriteTimeout = (int)readWriteTimeout.TotalMilliseconds;
           }
         }
         if (timeout > TimeSpan.Zero)
         {
-          req.Timeout = timeout.Milliseconds;
+          req.Timeout = (int)timeout.TotalMilliseconds;
         }
         return req;
       }