I have a question. How can i invoke a web service and get the result from a C# desktop application. I am making a desktop app and I want it to be able to connect to my onlin
This is possible the same way that you access web services from any other type of application, be it an ASP.NET page, a class library or windows service.
For an explanatory tutorial on the subject, see Accessing a Web Service from a Desktop Application.
Will get help how to create a webservice and consume that service:
http://www.c-sharpcorner.com/UploadFile/0c1bb2/consuming-web-service-in-Asp-Net-web-application/
Thanks
AB Kolan was also correct, but Add Web Reference uses the old-style web services framework whereas Add Service References uses the new WCF stack. Important note: It is not required that the service itself use WCF for you to use WCF on the client side. WCF on the client is typically the best choice for any service, provided you can take a dependency on .NET 3.0 and above.
Add a Web Reference to the webservice in your Desktop App project reference. Doing so would generate a Proxy for the Webservice called Reference.cs You can access your webservice using the proxy.