top.ascx是头部控件，里面有个label控件，显示注册的总人数，是从数据库中读取的。可是把top.ascx放到default.aspx页面中调试运行时，label未显示任何数据，visible为true，后来直接设置Label1.Text = "123"，调试也没反应
代码如下：
Partial Class top
  Inherits System.Web.UI.UserControl
  Dim Label1 As System.Web.UI.WebControls.Label
  ‘Dim label2 As System.Web.UI.WebControls.Label
  ‘Dim Label3 As System.Web.UI.WebControls.Label
  ‘Dim Label4 As System.Web.UI.WebControls.Label
  ‘Dim label5 As System.Web.UI.WebControls.Label
  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
  Dim sqlstr As String = "select count(*) from CustomerInfo"
  Dim constr As String = "server=’(local)’;database=’zl’;uid=’sa’;pwd=’123′"
  Dim con As SqlConnection = New SqlConnection(constr)
  con.Open()
  Dim cmd As SqlCommand = New SqlCommand(sqlstr, con)

  ‘ CType(Me.FindControl("Label1"), Label).Text = cmd.ExecuteScalar.ToString

  Label1.Text = cmd.ExecuteScalar().ToString() ”以对象的形式返回查询结果的第一行第一列
  ‘label1.Text = "123"
  con.Close()