Execute Web Service via GET Method.

Introduction

When we create any web service via Vistual Studio, by Default it gets executed via HTTP Post. This article explains how we can configure our web service so it runs on both the method that is GET and POST.

Demonstration

When we created any web service via Vistual Studio, we always get a default method named “Hello world”.

When you hit this URL in your browser, http://localhost/SampleWebService/Service.asmx, it shows list of all the web method. Click on Hello World and then Invoke. It gives following output:

I am assuming that you have hosted your web service in IIS.

   <?xml version="1.0" encoding="utf-8" ?>

  <string xmlns="http://tempuri.org/">Hello World</string>

Looks good. Now let’s go and modify our service.cs file and add a new method which takes one parameter.

[WebMethod]
 public string HelloWorldWithParam(int a)
 {
        return "Hello World " + a.ToString();
 }

Click on HelloWorldWithParam. It asks for parameter value. Without giving any value just click invoke.

It shows following error:

Above error is coming as method is expecting a value, and method tries to convert null value to string. If you refresh your browser or try to modify the URL by adding querystring then also following error comes:

<webServices>
      <protocols>
        <add name="HttpGet"/>
        <add name="HttpPost"/>
      </protocols>
</webServices>