BlueSky.Commands.Tools.Package.PackageHelperMethods.GetStringArrayUncommon C# (CSharp) Method

        public string[] GetStringArrayUncommon(string[] largearr, string[] smallarr)
        {
            int diff = largearr.Length - smallarr.Length;
            string[] strarr = new string[diff];
            int i = 0;
            bool found = false;
            foreach (string s in largearr)
            {
                found = false;
                foreach (string ss in smallarr)
                {
                    if (s.Equals(ss))
                    {
                        found = true;
                        break;
                    }
                }
                if (!found)
                {
                    strarr[i] = s;
                    i++;
                }
            }
            return strarr;
        }
        #endregion

        protected override void OnExecute(object param)
        {
            try
            {
                PackageHelperMethods phm           = new PackageHelperMethods();
                UAReturn             rlst          = phm.ShowInstalledPackages();
                string[]             installedpkgs = phm.GetUAReturnStringResult(rlst);

                UAReturn rlst2        = phm.ShowLoadedPackages();
                string[] loadededpkgs = phm.GetUAReturnStringResult(rlst2);
                string[] strarr       = phm.GetStringArrayUncommon(installedpkgs, loadededpkgs);

                //Create UI show list of installed packges so that user can select and load them
                SelectPackagesWindow spw = new SelectPackagesWindow(strarr);
                spw.header = "Load Library(s)";
                spw.ShowDialog();
                IList <string> sel = spw.SelectedItems;
                if (sel == null)
                {
                    return;
                }

                string[] selectedpackages = new string[sel.Count];
                int      i = 0;
                foreach (string s in sel)
                {
                    selectedpackages[i] = s;
                    i++;
                }


                // Pass List of selected packages to load them
                UAReturn r = phm.LoadPackageFromList(selectedpackages);// LoadPackageFromList();
                if (r != null && r.Success)
                {
                    SendToOutputWindow("Load Package(s)", r.CommandString);
                }
                else
                {
                    if (r.CommandString != null && r.CommandString.Trim().Length < 1)
                    {
                    }
                    else if (r.CommandString != null && r.CommandString.Trim().Length > 0)
                    {
                        SendToOutputWindow("Error Loading Package(s)", r.CommandString);
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error while loading package.", "Error Occurred!");
                logService.WriteToLogLevel("Error:", LogLevelEnum.Error, ex);
            }
        }