How Web service create Proxy and dll Using WSDL?

In this  post  we are going to understand  how create web service proxy and consume service into console application(Client).

Building Web Service Clients using the .NET Framework:

            Clients communicate with Web Services using standard web protocols, using XML-encoded messages to send and receive messages between themselves. This makes it possible for client applications running on any platform to access web services as long as they use standard web protocols, and understand the XML-encoded messages. 

          There are three protocols that web clients can use to communicate with web services namely,

1. HTTP GET
2. HTTP POST 
3. SOAP.

          The various steps that are involved in creating a Web Service Client using C# and the .NET Framework are as follows:

1. Generate a Proxy for the Web Service
2. Compile the Proxy as a DLL library
3. Create a Visual C# - Console Application Project

1. Generate a Proxy class for the Web Service

.NET SDK provide WSDL.exe utility to generate proxy source code for an existing web service.WSDL.exe utility take a WSDL file as input to generate proxy source code.

we can generate proxy source code for the actual web service as shown below:

1.Go to .NET Command prompt

2.Type following command to create proxy source code

WSDL http://hostServer/WebserviceRoot/WebServiceName.asmx?WSDL

(Created new proxy class file and it's located into default .NET command prompt folder)

 OR

WSDL /out:myProxyClass.cs http://hostServer/WebserviceRoot/WebServiceName.asmx?WSDL

if we want to create proxy class as specific user defined name, we can specify class name in next to out keyword.

2. Compile the Proxy class as a DLL Library

          We can compile the C# generated proxy class file into a dynamic link library (DLL) and then add a reference to this DLL to any project we want to consume service.

3. Create a Visual C# - Console application

1. Create a new Visual C# console application in order to consume web service and add a reference to the already created DLL(based on point no.1 & 2).
2. We create an instance of the proxy class and call functionality wherever required.
3. Build the project file and run the client.