ASP.NET with VB.NET Web Services

Web services are used to create distributed, loosely-coupled systems. In ASP.NET with VB.NET, web services are created using Visual Studio and can be accessed from any client application that supports XML and SOAP.

Syntax

Public Class MyWebService
    Inherits System.Web.Services.WebService

    <WebMethod()> _
    Public Function HelloWorld() As String
        Return "Hello World"
    End Function
End Class

Here, MyWebService is the name of the web service class, and HelloWorld is the name of the web method. The WebMethod attribute is used to specify that this is a web method that can be called from a client application.

Example

Public Class MyWebService
    Inherits System.Web.Services.WebService

    <WebMethod()> _
    Public Function AddTwoNumbers(ByVal num1 As Integer, ByVal num2 As Integer) As Integer
        Return num1 + num2
    End Function
End Class

In this example, we have created a web method called AddTwoNumbers that takes two integers as input and returns their sum.

Output

The output of the web service will be the integer sum of the two input numbers.

Explanation

In the above example, we have created a simple web service that adds two numbers together. The WebMethod attribute is used to specify that this is a web method that can be accessed from a client application. The two input parameters are passed as ByVal parameters, and the function returns their sum.

Use

ASP.NET web services can be used to create distributed, loosely-coupled systems. They can be used to expose functionality to client applications over the internet, and are an important part of modern web development.

Important Points

• ASP.NET web services are created using Visual Studio.
• Web methods are marked with the WebMethod attribute.
• Web methods can take input parameters and return values.
• Web services are accessed using XML and SOAP.

Summary

In summary, ASP.NET with VB.NET web services are used to create distributed, loosely-coupled systems. They are created using Visual Studio and web methods are marked with the WebMethod attribute. They can be used to expose functionality to client applications over the internet, and are an important part of modern web development.