.net 定时器Timer用法（Timeofday）

 Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim sql As String
Dim dt As New DataTable
        Time2 = "11:14:00" '设置定时的时间，24小时制 ,应该放在出事加载程序中
        Timer1.Interval = 1000 '设置计时器每秒钟运行一次 ,应该放在出事加载程序中

        Timer1.Enabled = True '计时器开始运行 ,应该放在出事加载程序中

        Time1 = TimeOfDay() '获取当前时间
        rownum.Text = Time1
If Time1 = Time2 Then
Dim age
If agetext.Text = "" Then
                age = 0
Else
                age = Val(agetext.Text)
End If
            sql = "select * from student where  sid='" & xuehaotext.Text & "'"
            conn = connect_db()
            rs = New SqlDataAdapter(sql, conn)
'conn.Close()
            rs.Fill(dt) '填充表
            DataGridView1.DataSource = dt '将表中的数据显示到datagridView控件中，绑定数据
            DataGridView1.Columns(0).HeaderText = "学号" '设置列名
            DataGridView1.Columns(1).HeaderText = "姓名"
            DataGridView1.Columns(2).HeaderText = "年龄"
            DataGridView1.Columns(3).HeaderText = "成绩"
            rownum.Text = Str(DataGridView1.RowCount) '获取行数
            xuehaotext.Text = DataGridView1.Rows(0).Cells(0).Value '获取datagridview中的某个值
            nametext.Text = DataGridView1.Rows(0).Cells(1).Value
If (DataGridView1.Rows(0).Cells(2).Value = 0) Then
                agetext.Text = ""
Else
                agetext.Text = Str(DataGridView1.Rows(0).Cells(2).Value)
End If
If (DataGridView1.Rows(0).Cells(3).Value = 0) Then
                scoretext.Text = ""
Else
                scoretext.Text = Str(DataGridView1.Rows(0).Cells(3).Value)
End If
End If
End Sub