Error: Timeout While Debugging Web Services
Applies to: 
Visual Studio 
Visual Studio for Mac
Note
This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here
When you are stepping into an XML Web service from calling code, the call may sometimes time out, with the result being that you cannot continue debugging. You may see an error message such as this.
An unhandled exception of type 'System.Net.WebException' occurred in
system.Web.services.dll
Additional information: The operation has timed-out.
Solution
To avoid this problem, set the timeout value for the call to the XML Web service to infinite, as shown in this example:
Service1 obj = new Service1();
obj.TimeOut = -1; // infinite time out.