Copy List Item Permission/ Role Assignment SharePoint Server Object Model

        public static void CopyListItemsRoleAssignments(SPList sourceList, SPList destinationList)
        {
            foreach (SPListItem sourceListitem in sourceList.Items)
            {
                CopyListItemRoleAssignments(sourceListitem, destinationList.GetItemById(sourceListitem.ID));
            }

        }
        public static void CopyListItemRoleAssignments(SPListItem sourceListItem, SPListItem destinationListItem)
        {
            //First check if the Source List has Unique permissions
            if (sourceListItem.HasUniqueRoleAssignments)
            {

                Break List permission inheritance first
                destinationListItem.BreakRoleInheritance(true);
                destinationListItem.Update();

               // Remove current role assignemnts
                while (destinationListItem.RoleAssignments.Count > 0)
                {
                    destinationListItem.RoleAssignments.Remove(0);
                }
                destinationListItem.Update();

                //Copy Role Assignments from source to destination list.
                foreach (SPRoleAssignment sourceRoleAsg in sourceListItem.RoleAssignments)
                {
                    SPRoleAssignment destinationRoleAsg = null;

                    Get the source member object
                    SPPrincipal member = sourceRoleAsg.Member;

                    //Check if the member is a user
                    try
                    {
                        SPUser sourceUser = (SPUser)member;
                        SPUser destinationUser = destinationListItem.ParentList.ParentWeb.AllUsers[sourceUser.LoginName];
                        if (destinationUser != null)
                        {
                            destinationRoleAsg = new SPRoleAssignment(destinationUser);
                        }
                    }
                    catch
                    { }

                    ///Not a user, try check if the member is a Group
                    if (destinationRoleAsg == null)
                    {
                        Check if the member is a group
                        try
                        {
                            SPGroup sourceGroup = (SPGroup)member;
                            SPGroup destinationGroup = destinationListItem.ParentList.ParentWeb.SiteGroups[sourceGroup.Name];
                            if (destinationGroup != null)
                            {
                                destinationRoleAsg = new SPRoleAssignment(destinationGroup);
                            }
                        }
                        catch
                        { }
                    }

                    //At this state we should have the role assignment established either by user or group
                    if (destinationRoleAsg != null)
                    {

                        foreach (SPRoleDefinition sourceRoleDefinition in sourceRoleAsg.RoleDefinitionBindings)
                        {
                            try { destinationRoleAsg.RoleDefinitionBindings.Add(destinationListItem.ParentList.ParentWeb.RoleDefinitions[sourceRoleDefinition.Name]); }
                            catch { }
                        }

                        if (destinationRoleAsg.RoleDefinitionBindings.Count > 0)
                        {
                            handle additon of an existing  permission assignment error
                            try { destinationListItem.RoleAssignments.Add(destinationRoleAsg); }
                            catch (ArgumentException) { }
                        }

                    }

                }

               // Ensure item update metadata is not affected.
                destinationListItem.SystemUpdate(false);
            }
            else
                ///No need to assign permissions
                return;



        }