check box list problem facing with check boxes

Question

protected void Button1_Click(object sender, EventArgs e)

{

{

string msg = "";

if (CheckBoxList1.Checked == true)

{

msg = "trading account";

}

if (CheckBoxList1.Checked == true)

{

msg = msg + " insurance";

}

if (CheckBoxList1.Checked == true)

{

msg = msg + " adhar card";

}

if (CheckBoxList1.Checked == true)

{

msg = msg + " 2&4 wheeler insurance";

}

if (msg.Length > 0)

{

MessageBox.Show(msg + " selected ");

}

else

{

MessageBox.Show("No checkbox selected");

}

CheckBoxList1.ThreeState = true;

}

}

}

in the above code i am getting the name checked does not exist in the present content