ASP.NET WCF Service Application in VB.NET

In this article you will learn how to create a 'WCF Service Application' and Use it in ASP.NET.
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Introduction: How to create a 'WCF Service Application' and Use it in other applications of client's.

For Example, Suppose we want to use a WCF service in our 'ASP.NET Web Application' and we don't write any code for that so how it will be possible? For this purpose, read these steps carefully:

Step 1: Open visual studio and click on file menu.
  • Go to new -> project.
  • New project dialog box will appear.
  • Select WCF -> WCF Service Application.
  • Give the name as you desire.
  • Press ok as shown below on figure:
vb1.gif
 
  • Service1.svc.vb will be open.

Step 2: Go to solution explorer.
  • open the Iservice1.vb.
  • write a code like:

Code:

   'NOTE: You can use the "Rename" command on the context menu to change the interface name "IService1" in both code and config file together.

<ServiceContract()>
Public Interface IService1

   
<OperationContract()>
     Function sum(x As Integer, y As Integer) As Integer

   
<OperationContract()>
     Function
sendmessage(message As String) As String

   
 ' TODO: Add your service operations here

End Interface

 Step 3: Now, open the Service1.svc.vb.

  • write the code like:

Code:

    'NOTE: You can use the "Rename" command on the context menu to change the class name "Service1" in code, svc and config file together.

Public Class Service1
   
 Implements IService1

     Public Sub New()
     End
Sub

    Public
Function sum(x As Integer, y As Integer) As Integer Implements IService1.sum
        Return
x + y
     End Function

    Public Function sendmessage(message As String) As String Implements IService1.sendmessage
        Console.WriteLine(message)
        Return
String.Format("  Message Received")
     End Function

End
Class

Step 4: Start Debugging by pressing F5.

  • A dialog box will appear i.e 'WCF Test Client'.

  • Copy the highlighted address as shown below in figure:


vb4.gif 

Step 5: Open the visual studio and go to the file menu.

  • Select new -> project.

  • Select any type of application. Suppose we add 'ASP.NET Web Application'.

Step 6: Go to Solution Explorer.

  • Right click on 'References' and select 'Add Service Reference...'

  • 'Add Service Reference' dialog box will appear.

  • Paste the address which is copied in step 4.

  • Press OK button as shown below in the figure:

vb5.gif
 

Step 7: Now, take a control like 'Button' in the div tag on Form design as shown in the figure:

vb2.gif
 

  • Write the code on 'WebForm1.aspx.vb' as:

Code:

Public Class WebForm1
   
Inherits System.Web.UI.Page

   
 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

     End
Sub

     Protected
Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim
obj As New ServiceReference1.Service1Client()

        Response.Write(obj.sum(5, 4).ToString())
        Response.Write(obj.sendmessage("Message received"))
    End
Sub
End Class

Step 8: Now we press F5 and run this application and result shows like figure below:

vb3.gif

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