Soap Request And Response Example In Asp.net

Every SOAP request and response are made of SOAPEnvelope. SOAPEnvelope has SOAPHeader, SOAPBody, SOAPFault.

SOAP uses Http Post method and the SOAPEnvelope is submitted as MessageBody.

A Webservice created in .Net could be used by an Http Client also. Here the method name is submitted as the PathInfo and the parameters are posted as a string of Name-Value pairs..

http:// ServerName/ApplicationName/ DemoService.asmx/ MethodName

SOAP Request

POST /DecWebServices/DemoService.asmx HTTP/1.1

Host: localhost

Content-Type: text/xml; charset=utf-8

Content-Length: length

SOAPAction: “http://tempuri.org/Add”

<?xml version=”1.0″ encoding=”utf-8″?>

<soap:Envelopexmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xmlns:xsd=”http://www.w3.org/2001/XMLSchema” xmlns:soap=”http://schemas.xmlsoap.org/soap/envelope/”>

<soap:Body>

<Add xmlns=”http://tempuri.org/”>

<a>int</a>

<b>int</b>

</Add>

</soap:Body>

</soap:Envelope>

SOAP Response

HTTP/1.1 200 OK

Content-Type: text/xml; charset=utf-8

Content-Length: length

<?xml version=”1.0″ encoding=”utf-8″?>

<soap:Envelopexmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”xmlns:xsd=”http://www.w3.org/2001/XMLSchema” xmlns:soap=”http://schemas.xmlsoap.org/soap/envelope/”>

<soap:Body>

<AddResponse xmlns=”http://tempuri.org/”>

<AddResult>int</AddResult>

</AddResponse>

</soap:Body>

</soap:Envelope>

Note: To view the WSDL document we can use the following URL
http://localhost/SepWebServices/Service.asmx?wsdl

Client Application: (In New Instance of VS.NET)

Step 3: File –> New Project –> Windows Application
Step 4: In the Solution Explorer –> References –> Right Click –> Add Service Reference –> In URL give the Url of Web Service(can copy from browser where we can see the webservice methods) –> Click on Go.
Step 5: In the same dialog:Namespace = localhost (name of the domain on which the web service is hosted is used)

To note: When a WebService reference is added in VS.Net that is using add Web reference it automatically creates a proxy class in the current project using a utility program called asWSDL.EXE. The same can be viewed by opening the file Reference.cs.

Step 6:
Use WebServiceClientAppName.localhost
private void btnDemo_Click(object sender, EventArgs e)
{
DemoServiceSoapClient ds = new DemoServiceSoapClient();
MessageBox.Show(ds.Add(20, 50).ToString());
}

Step 7: Run the Client Application

To note: If a new method is added to the webservice class, right click on web reference of the webservice and choose Update service Reference to reflect the new method in the proxy class.

We conclude for now. Keep coding!!

Let us know your opinion in the comments sections below. And feel free to refer Microsoft’s site to gather more information.

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