Asp.Net value insert into database

<form id="form1" runat="server">
     <asp:checkbox id="chkBox" runat="server" text="Agreed" xmlns:asp="#unknown">
                              oncheckedchanged="chkBox_CheckedChanged" />
</form>
</asp:checkbox>

protected void chkBox_CheckedChanged(object sender, EventArgs e)
    {
        SqlConnection conn = null;

        try
        {
            using (conn=new SqlConnection("YourConnectionString"))
            {
                String strSQL=String.Empty;
                strSQL=String.Format("INSERT Test(Agrement) VALUES({0})",chkBox.Checked);

                SqlCommand cmd=new SqlCommand();
                cmd.Connection=conn;
                cmd.CommandText=strSQL;
                cmd.CommandType=System.Data.CommandType.Text;

                int intResult=cmd.ExecuteNonQuery();
            }

        }
        catch (Exception)
        {

            throw;
        }
        finally
        {
            conn.Close();
            conn=null;
        }
    }