form4.vb

根据系统的长期目标

Public Class Form4
    Inherits System.Windows.Forms.Form
    Dim mconnection As New SqlClient.SqlConnection
    Dim a As Integer

#Region " Windows 窗体设计器生成的代码 "

    Public Sub New()
        MyBase.New()

        '该调用是 Windows 窗体设计器所必需的。
        InitializeComponent()

        '在 InitializeComponent() 调用之后添加任何初始化

    End Sub

    '窗体重写 dispose 以清理组件列表。
    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

    'Windows 窗体设计器所必需的
    Private components As System.ComponentModel.IContainer

    '注意: 以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器修改此过程。
    '不要使用代码编辑器修改它。
    Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.GroupBox1 = New System.Windows.Forms.GroupBox
        Me.TextBox2 = New System.Windows.Forms.TextBox
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.Label2 = New System.Windows.Forms.Label
        Me.Label1 = New System.Windows.Forms.Label
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.GroupBox1.SuspendLayout()
        Me.SuspendLayout()
        '
        'GroupBox1
        '
        Me.GroupBox1.Controls.Add(Me.TextBox2)
        Me.GroupBox1.Controls.Add(Me.TextBox1)
        Me.GroupBox1.Controls.Add(Me.Label2)
        Me.GroupBox1.Controls.Add(Me.Label1)
        Me.GroupBox1.Location = New System.Drawing.Point(32, 48)
        Me.GroupBox1.Name = "GroupBox1"
        Me.GroupBox1.Size = New System.Drawing.Size(232, 136)
        Me.GroupBox1.TabIndex = 0
        Me.GroupBox1.TabStop = False
        '
        'TextBox2
        '
        Me.TextBox2.Location = New System.Drawing.Point(96, 96)
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.PasswordChar = Microsoft.VisualBasic.ChrW(42)
        Me.TextBox2.TabIndex = 3
        Me.TextBox2.Text = ""
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(96, 40)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.TabIndex = 2
        Me.TextBox1.Text = ""
        '
        'Label2
        '
        Me.Label2.AutoSize = True
        Me.Label2.Location = New System.Drawing.Point(40, 96)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(35, 17)
        Me.Label2.TabIndex = 1
        Me.Label2.Text = "密码:"
        '
        'Label1
        '
        Me.Label1.AutoSize = True
        Me.Label1.Location = New System.Drawing.Point(40, 40)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(35, 17)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "编号:"
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(40, 224)
        Me.Button1.Name = "Button1"
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "确定"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(184, 224)
        Me.Button2.Name = "Button2"
        Me.Button2.TabIndex = 2
        Me.Button2.Text = "退出"
        '
        'Form4
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(304, 273)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.GroupBox1)
        Me.Controls.Add(Me.Button1)
        Me.MaximizeBox = False
        Me.MinimizeBox = False
        Me.Name = "Form4"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "管理员登录窗口"
        Me.GroupBox1.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Me.Close()
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        TextBox1.Text = TextBox1.Text.Trim
        TextBox2.Text = TextBox2.Text.Trim
        Try
            '连接数据库
            mconnection.ConnectionString = connstr
            mconnection.Open()
            Dim mcommand As New SqlClient.SqlCommand
            mcommand.Connection = mconnection
            '查找相应的编号和密码
            mcommand.CommandText = "select 编号,密码 from 售票员信息 where 编号 like '"
            mcommand.CommandText += TextBox1.Text + "'"
            Dim mreader As SqlClient.SqlDataReader
            mreader = mcommand.ExecuteReader()
            If Not (mreader.Read()) Then                '如果找不到
                MsgBox("不存在本编号的管理员,请确认!")
                Exit Sub
            End If
            '如果找到
            If Trim(mreader("密码").ToString) = Trim(TextBox2.Text).ToString Then
                cdct_id = Trim(TextBox1.Text).ToString
                Dim f1 As New Form1
                f1.Show()
                f1.TabPage4.Enabled = False
                f1.TabPage5.Enabled = False
                f1.TabPage6.Enabled = False
                f1.TabPage7.Enabled = False
                Me.Hide()
            Else
                If a = 3 Then
                    MsgBox("对不起,你无权使用,再见!")
                    Me.Close()
                Else
                    MsgBox("密码错误,请确认!")
                    TextBox2.Text = ""
                    TextBox2.Focus()
                    a = a + 1
                End If
            End If
        Catch ex As Exception
            Debug.WriteLine(ex.Message)
        Finally
            mconnection.Close()
        End Try
    End Sub

    Private Sub TextBox1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown
        Select Case e.KeyCode
            Case Keys.Enter
                Button1_Click(Nothing, Nothing)
        End Select
    End Sub

    Private Sub TextBox2_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox2.KeyDown
        Select Case e.KeyCode
            Case Keys.Enter
                Button1_Click(Nothing, Nothing)
        End Select
    End Sub
End Class