How to check if the Logged user is in Multiple Groups....!

try

            {

                writer.Write("<Table width='100%'>");

                writer.Write("<Tr>");

                writer.Write("<Td Align='Center'>");

                writer.Write("<Strong>");

                writer.Write("How to check if the current logged user is in Multiple Groups...!");

                writer.Write("</Strong>");

                writer.Write("<Td>");

                writer.Write("</Tr>");

                bool strCurrentUser = false;

                SPSecurity.RunWithElevatedPrivileges(delegate()

                {

                    SPWeb currentWeb = SPContext.Current.Web;

                    SPGroupCollection grp = currentWeb.Groups;

                    foreach (SPGroup group in grp)

                    {

                        if (group.ID == 5)

                        {

                            strCurrentUser = true;

                        }

                    }

                    if (strCurrentUser == false)

                    {

                        writer.Write("<Tr>");

                        writer.Write("<Td>");

                        writer.Write("<Strong>");

                        writer.Write("Current user is not an Administrator...!");

                        writer.Write("</Strong>");

                        writer.Write("<Td>");

                        writer.Write("</Tr>");

                    }

                    else

                    {

                        writer.Write("<Tr>");

                        writer.Write("<Td>");

                        writer.Write("<Strong>");

                        writer.Write("Current User is an Administrator");

                        writer.Write("</Strong>");

                        writer.Write("<Td>");

                        writer.Write("</Tr>");

                    }

                });

                writer.Write("</Table>");

            }

            catch (Exception ex)

            {

                writer.Write(ex.ToString());

            }