login2.aspx.vb

VB.NET和SQLSERver2000编写在线考试系统

Public Class Login2
    Inherits System.Web.UI.Page

#Region " Web 窗体设计器生成的代码 "

    '该调用是 Web 窗体设计器所必需的。
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()

    End Sub
    Protected WithEvents Image1 As System.Web.UI.WebControls.Image
    Protected WithEvents Image2 As System.Web.UI.WebControls.Image
    Protected WithEvents Image9 As System.Web.UI.WebControls.Image
    Protected WithEvents Image7 As System.Web.UI.WebControls.Image
    Protected WithEvents Image6 As System.Web.UI.WebControls.Image
    Protected WithEvents Image5 As System.Web.UI.WebControls.Image
    Protected WithEvents Image4 As System.Web.UI.WebControls.Image
    Protected WithEvents Image3 As System.Web.UI.WebControls.Image
    Protected WithEvents Image8 As System.Web.UI.WebControls.Image
    Protected WithEvents TextBox2 As System.Web.UI.WebControls.TextBox
    Protected WithEvents Label1 As System.Web.UI.WebControls.Label
    Protected WithEvents TextBox1 As System.Web.UI.WebControls.TextBox
    Protected WithEvents Label2 As System.Web.UI.WebControls.Label
    Protected WithEvents ImageButton1 As System.Web.UI.WebControls.ImageButton
    Protected WithEvents ImageButton2 As System.Web.UI.WebControls.ImageButton
    Protected WithEvents DropDownList1 As System.Web.UI.WebControls.DropDownList
    Protected WithEvents Label3 As System.Web.UI.WebControls.Label

    '注意: 以下占位符声明是 Web 窗体设计器所必需的。
    '不要删除或移动它。
    Private designerPlaceholderDeclaration As System.Object

    Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
        'CODEGEN: 此方法调用是 Web 窗体设计器所必需的
        '不要使用代码编辑器修改它。
        InitializeComponent()
    End Sub

#End Region
    Public Sub message(ByVal str As String)
        Dim strscript As String = "<script language=javascript>alert('" & str & "')</script>"
        RegisterClientScriptBlock("系统消息", strscript)
    End Sub
    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        '在此处放置初始化页的用户代码
        If Not IsPostBack Then
            Dim q As SqlClass = New SqlClass
            q.Open()
            Dim str As String = "select 试卷名称 from 试卷名称表"
            Dim Dt As DataTable = q.GetDataTable(str, "试卷名称")
            Dim dv As DataView = New DataView(Dt)
            Dim i As Integer
            For i = 0 To dv.Count - 1
                Dt.Rows(i)("试卷名称") = Dt.Rows(i)("试卷名称").ToString().Substring(0, Dt.Rows(i)("试卷名称").ToString().Length - 3)
            Next
            DropDownList1.DataSource = Dt
            DropDownList1.DataTextField() = Dt.Columns("试卷名称").ToString
            DropDownList1.DataValueField() = Dt.Columns("试卷名称").ToString
            DropDownList1.DataBind()
            DropDownList1.SelectedIndex = 0
            q.close()
        End If
    End Sub

    Private Sub ImageButton2_Click(ByVal sender As System.Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles ImageButton2.Click
        Response.Redirect("welcome.aspx")
    End Sub

    Private Sub ImageButton1_Click(ByVal sender As System.Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles ImageButton1.Click
        Dim s As String
        Dim name As String = Trim(TextBox1.Text)
        Dim psd As String = Trim(TextBox2.Text)
        Dim q As SqlClass = New SqlClass
        q.Open()
        If name = "" Then
            message("用户名不能为空！")
        Else
            If psd = "" Then
                message("密码不能为空！")
            Else

                Dim str2 As String = "select 题库 from 单位记录表 where 用户名='" & name & "' and  密码='" & psd & "' and 题库='" & DropDownList1.SelectedValue & "'"
                If q.GetString(str2) <> "" Then
                    Session("username") = name
                    Session("userpower") = 2
                    Session("tablename") = DropDownList1.SelectedValue
                    Response.Redirect("addproblem.aspx")
                Else
                    message("用户名或密码错误")

                End If
            End If
        End If
        q.close()
    End Sub
End Class