Copy List Permission/RoleAssigment from Source List to Destination List SharePoint

public static void CopyListRoleAssignments(SPList sourceList, SPList destinationList)
        {
            //First check if the Source List has Unique permissions
            if (sourceList.HasUniqueRoleAssignments)
            {

                //Break List permission inheritance first
                destinationList.BreakRoleInheritance(true);

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


                //Copy Role Assignments from source to destination list.
                foreach (SPRoleAssignment sourceRoleAsg in sourceList.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 = destinationList.ParentWeb.Users.GetByEmail(sourceUser.Email);
                        destinationRoleAsg = new SPRoleAssignment(destinationUser);
                    }
                    catch
                    { }

                    if (destinationRoleAsg == null)
                    {
                        //Check if the member is a group
                        try
                        {
                            SPGroup sourceGroup = (SPGroup)member;

                            SPGroup destinationGroup = destinationList.ParentWeb.SiteGroups[sourceGroup.Name];
                            destinationGroup.AddUser((SPUser)member);
                            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(destinationList.ParentWeb.RoleDefinitions[sourceRoleDefinition.Name]); }
                            catch { }
                        }

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

                    }

                }

               // Does not require list update
                destinationList.Update();
            }
            else
                //No need to assign permissions
                return;



        }