How to apply the WebMethod attribute?

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How to apply the WebMethod attribute?

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The HelloWorld public method is not available with the Web service until the WebMethod attribute is attached to it. Take the following steps to apply the WebMethod attribute:

1. Use the following code to add the WebMethod attribute:
   
   [WebMethod]
   public string HelloWorld()
   {
      return "Hello World";
   }
   
   
2. Attach the WebMethod attribute as shown in the following code window:
   
   
   
   
3. Run the code; the following output window will open:
   
   

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