' 导入命名空间
Imports System.Windows.Forms

Public Class Form1
    Inherits System.Windows.Forms.Form

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) _
            Handles MyBase.Load

        Dim comboBox As New ComboBox
        Dim daysOfWeek As String() = _
            New String() {"Monday", "Tuesday", "Wednesday", _
                          "Thursday", "Friday", "Saturday", _
                          "Sunday"}

        With comboBox
            .DataSource = daysOfWeek
            .Location = New System.Drawing.Point(12, 12)
            .Name = "comboBox"
            .Size = New System.Drawing.Size(166, 21)
            .DropDownStyle = ComboBoxStyle.DropDownList
        End With

        Me.Controls.Add(comboBox)
    End Sub

End Class

' 导入命名空间
Imports System
Imports System.Data
Imports System.Data.OleDb
Imports System.Data.SqlClient
Imports System.Collections
Imports System.Windows.Forms
Imports System.Resources

Public Class MainClass
    Shared Sub Main()
        Dim form1 As Form = New Form1()
        Application.Run(form1)

    End Sub
End Class



Public Class Form1
    'Form level variables
    Private strConnectionString As String = _
        "Provider=Microsoft.Jet.OLEDB.4.0;" & _
        "Data Source=Employee.mdb;"

    Private objConnection As OleDbConnection
    Private objCommand As OleDbCommand
    Private objDataAdapter As OleDbDataAdapter
    Private objDataTable As DataTable

    Private Sub Form1_Load(ByVal sender As Object, _
        ByVal e As System.EventArgs) Handles Me.Load

        'Initialize the Connection object
        objConnection = New OleDbConnection(strConnectionString)

        'Initialize the Command object
        objCommand = New OleDbCommand("SELECT ID, FirstName " & _
            "FROM Employee", objConnection)

        'Initialize the DataAdapter object and set the SelectCommand property
        objDataAdapter = New OleDbDataAdapter
        objDataAdapter.SelectCommand = objCommand

        'Initialize the DataTable object
        objDataTable = New DataTable

        'Populate the DataTable
        objDataAdapter.Fill(objDataTable)

        'Bind the DataTable to the ComboBox
        ComboBox1.DataSource = objDataTable
        ComboBox1.DisplayMember = "FirstName"
        ComboBox1.ValueMember = "ID"

        'Clean up
        objDataAdapter.Dispose()
        objDataAdapter = Nothing
        objCommand.Dispose()
        objCommand = Nothing
        objConnection.Dispose()
        objConnection = Nothing
    End Sub
End Class


<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Public Class Form1
    Inherits System.Windows.Forms.Form

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        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.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.ComboBox1 = New System.Windows.Forms.ComboBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        '
        'ComboBox1
        '
        Me.ComboBox1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList
        Me.ComboBox1.FormattingEnabled = True
        Me.ComboBox1.Location = New System.Drawing.Point(76, 13)
        Me.ComboBox1.Name = "ComboBox1"
        Me.ComboBox1.Size = New System.Drawing.Size(205, 21)
        Me.ComboBox1.TabIndex = 3
        '
        'Label1
        '
        Me.Label1.AutoSize = True
        Me.Label1.Location = New System.Drawing.Point(13, 16)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(41, 13)
        Me.Label1.TabIndex = 2
        Me.Label1.Text = "Name"
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(292, 76)
        Me.Controls.Add(Me.ComboBox1)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)
        Me.PerformLayout()

    End Sub
    Friend WithEvents ComboBox1 As System.Windows.Forms.ComboBox
    Friend WithEvents Label1 As System.Windows.Forms.Label

End Class