VB返回代码中的NullException错误

问题描述

你好，

我在此代码中加载了数据的listview时出错，数据在那里-不是空字符串或其他任何东西.有什么想法吗?

Hello,

I get an error in this code that loads a listview with data, and the data is there - not empty strings or anything. Any ideas?

Partial Class Blank
    Inherits System.Web.UI.Page

    Protected Sub Button1_Click(sender As Object, e As System.EventArgs) Handles Button1.Click
        Dim lbl1, lbl2, lbl3 As New Label()

        lbl1 = CType(ListView1.FindControl("OptLabel"), Label)
        TextBox1.Text = lbl1.Text <<<<<<<< nullexception error right here but there is data in the Listview

    End Sub


End Class

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