asp.net (vb) มัน error ExecuteNonQuery: Connection property has not been initialized.

Imports System.Data
Imports System.Data.SqlClient

Partial Class _Default
    Inherits System.Web.UI.Page
    Dim Conn As SqlConnection
    Dim Cmd As SqlCommand
    Dim dtReader As SqlDataReader
    Dim sql As String

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim strConnString As String
        strConnString = "Data Source=IK-PC\HUSOC;Initial Catalog=db_husoc;Persist Security Info=True;User ID=user_husoc;Password=1842531;"
        Conn = New SqlConnection(strConnString)
        Conn.Open()
    End Sub

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If txtaddress.Text <> "" Then
            sql = "update tb_member set mem_address = '" & Me.txtaddress.Text & "' where mem_id = 1"
            Cmd = New SqlCommand(sql, Conn)
            Dim sta As String = Cmd.ExecuteNonQuery()
            If sta Then
                Me.lblText.Text = "บันทึกข้อมูลเรียบร้อย"
                Me.lblText.ForeColor = Drawing.Color.Green
            Else
                Me.lblText.Text = "เกิดข้อผิดพลาด"
                Me.lblText.ForeColor = Drawing.Color.Red
            End If
        Else
            Me.lblText.Text = "กรุณากรอกข้อมูล"
            Me.lblText.ForeColor = Drawing.Color.Red
            Me.txtaddress.Focus()
        End If

    End Sub
End Class