ขอความช่วยเหลือด่วนค่ะ ! การ insert ข้อมูลจาก checkboxlist

Imports System.Data.SqlClient
Imports System.Data
Imports System.Web.HttpContext
Partial Class how_to_use_CheckBoxList
    Inherits System.Web.UI.Page
    Dim add As Data.SqlClient.SqlParameter
    Dim con As New Data.SqlClient.SqlConnection()
    Dim cmd As New Data.SqlClient.SqlCommand()

    Protected Sub CheckBoxList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CheckBoxList1.SelectedIndexChanged
        Label1.Text = "Your speak the following language(s): " & CheckBoxList1.Text
    End Sub
    Public Sub insert()
        con.ConnectionString = "Data Source=YTC-MDN-MONGKOL\APLUS;Initial Catalog=Register;User ID=sa;Password=root"
        cmd.CommandText = "INSERT INTO Lanquage(Lanquage,ID)VALUES(@Lan,@ID)"

        cmd.Parameters.Add("@Lan", Data.SqlDbType.VarChar).Value = CheckBoxList1.SelectedItem
        cmd.Parameters.Add("@ID", Data.SqlDbType.VarChar).Value = Request.Params("ID")

        con.Open()
        cmd.Connection = con
        cmd.ExecuteNonQuery()
        con.Close()

    End Sub

    Protected Sub btSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btSubmit.Click
        insert()

    End Sub

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Response.Write("<b>Name : " + Request.Params("ID") + "<hr>")
    End Sub
End ClassCode (VB.NET)