Using a Web Service

To make use of a Web service, you have to add a Web reference to your application. We did that in the WebServWindowsApplication project in the In Depth section of this chapter; see that discussion for all the details. Here is the code for the WebServWindowsApplication application, Form1.vb:
Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.
   'Do not modify it using the code editor.
    Friend WithEvents DataGrid1 As System.Windows.Forms.DataGrid
    Friend WithEvents DataSet11 _
        As WebServWindowsApplication.localhost.DataSet1
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub _
        InitializeComponent()
        Me.DataGrid1 = New System.Windows.Forms.DataGrid()
        Me.DataSet11 = New WebServWindowsApplication.localhost.DataSet1()
        Me.Button1 = New System.Windows.Forms.Button()
        Me.Button2 = New System.Windows.Forms.Button()
        CType(Me.DataGrid1, _
            System.ComponentModel.ISupportInitialize).BeginInit()
        CType(Me.DataSet11, _
            System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'DataGrid1
        '
        Me.DataGrid1.DataMember = "authors"
        Me.DataGrid1.DataSource = Me.DataSet11
        Me.DataGrid1.HeaderForeColor = _
         System.Drawing.SystemColors.ControlText
        Me.DataGrid1.Location = New System.Drawing.Point(16, 56)
        Me.DataGrid1.Name = "DataGrid1"
        Me.DataGrid1.Size = New System.Drawing.Size(264, 176)
        Me.DataGrid1.TabIndex = 0
        '
        'DataSet11
        '
        Me.DataSet11.DataSetName = "DataSet1"
        Me.DataSet11.Locale = New System.Globalization.CultureInfo("en-US")
        Me.DataSet11.Namespace = "http://www.tempuri.org/DataSet1.xsd"
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(16, 16)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(96, 23)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Get Data"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(184, 16)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(96, 23)
        Me.Button2.TabIndex = 2
        Me.Button2.Text = "Update Data"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 253)
        Me.Controls.AddRange(New System.Windows.Forms.Control() _
            {Me.Button2, Me.Button1, Me.DataGrid1})
        Me.Name = "Form1"
        Me.Text = "Form1"
        CType(Me.DataGrid1, _
            System.ComponentModel.ISupportInitialize).EndInit()
        CType(Me.DataSet11, _
            System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click
        Dim WebServ As New WebServWindowsApplication.localhost.Service1()
        DataSet11.Merge(WebServ.GetAuthors())
    End Sub


    Private Sub Button2_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button2.Click
        If DataSet11.HasChanges() Then
            Dim WebServ As New _
                WebServWindowsApplication.localhost.Service1()
            Dim Changes As New _
                WebServWindowsApplication.localhost.DataSet1()
            Changes.Merge(DataSet11.GetChanges())
            DataSet11.Merge(WebServ.UpdateAuthors(Changes))
        End If
    End Sub
End Class