how to get the selected value of check-box in asp.net

 using (SqlConnection con = new SqlConnection(strConnString))
            {
                using (SqlCommand cmd = new SqlCommand(@"insert into myTable(UserID, Name) values( @UserID, @Name)"))                                                                                            

                {
                    using (SqlDataAdapter sda = new SqlDataAdapter())
                    {
                        cmd.CommandType = CommandType.Text;
                        cmd.Parameters.AddWithValue("@UserID", tempUser.ToString());

                        cmd.Parameters.AddWithValue("@Name", chckNM.Checked);

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

                    }

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<asp:CheckBox ID="chckNM" runat="server" />

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