Use of WCF Service Library in a Web Application

Introduction: Using WCF service library in a Web Application.

Here, we are using WCF service library in a Web Application by making a Demo of Calculator. We take four buttons i.e (ADD,SUB,MULTIPLY,DIVISION).

Creating WCF service:

Step 1: 

• Open  VS 2008 > Projects > Select Visual Basic >  WCF  > WCF Service Library.
  
  
• Type name of  the service file as u need I give 'WcfServiceLibrary1' then click Ok as shown below in figure:

• Add the Namespace System.ServiceModel and also add Reference in Solution Explorer.
  
  
• Type the Code in Interface file and class file as shown below.
  
  
• Code in Interface(EX: IService1.vb)

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.

     <ServiceContract()> _

     Public Interface IService1

        <OperationContract()> _
         Function add(a As Integer, b As Integer) As Integer
        <OperationContract()> _
        Function [Sub](a As Integer, b As Integer) As Integer
        <OperationContract()> _
        Function Mul(a As Integer, b As Integer) As Integer
        <OperationContract()> _
        Function Div(a As Integer, b As Integer) As Integer

        ' TODO: Add your service operations here
    End Interface

Step 2:

Code in Class file(EX: Service1.vb)

Public Class Service1
    Implements IService1

    Public Function add(a As Integer, b As Integer) As Integer
        Return (a + b)
    End Function

    Public Function [Sub](a As Integer, b As Integer) As Integer
        If a >= b Then
            Return (a - b)
        Else
            Return (b - a)
        End If
    End Function

    Public Function Mul(a As Integer, b As Integer) As Integer
        Return (a * b)
    End Function

    Public Function Div(a As Integer, b As Integer) As Integer
        If a >= b Then
            Try
                Return (a \ b)
            Catch
                Return 0
            End Try
            Else
                Return (b \ a)
       End If
    End Function
End Class

Step 3: Start Debugging by pressing F5.

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

• Copy the highlighted address as shown below in figure:

Consuming WCF Service in Web Application:

Step 4: 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'.

• Give the name "Webcalculator" and press OK button as shown below in figure:

Step 5: 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 figure:

• Also add the namespace "using Webcalculator.ServiceReference1";

Step 6: Now, take five controls in the div tag on orm design.

• 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
    End Sub

End Class

Partial Public Class WebForm1
    Inherits System.Web.UI.Page
   
    Protected Sub Page_Load(sender As Object, e As EventArgs)
        Response.Write("MY Calculator")
    End Sub
   
    Private Client As New ServiceReference1.Service1Client()
    Protected Sub Button1_Click(sender As Object, e As EventArgs)
        TextBox1.Text = (Client.add(10, 5).ToString())
    End Sub

    Protected Sub Button2_Click(sender As Object, e As EventArgs)
        TextBox1.Text = (Client.add(10, 6).ToString())
    End Sub
   
    Protected Sub Button3_Click(sender As Object, e As EventArgs)
        TextBox1.Text = (Client.add(10, 7).ToString())
    End Sub

    Protected Sub Button4_Click(sender As Object, e As EventArgs)
        TextBox1.Text = (Client.add(10, 8).ToString())
    End Sub
End Class

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