public static void AssignPRJDialog()
        {
            string value = MSCPrj.ReadWKT(AfaDocData.ActiveDocData.Document);

            if (!string.IsNullOrEmpty(value) && AfaDocData.ActiveDocData.DocDataset.FeatureServices.Count > 0)
            {
                AfaDocData.ActiveDocData.Document.Editor.WriteMessage(AfaStrings.ChangeCoordSysErrorFeatureServicesPresent + "\n");
                return;
            }
            OpenFileDialog openFileDialog = new OpenFileDialog();

            openFileDialog.Title            = AfaStrings.OpenCoordinateSystemSource;
            openFileDialog.Filter           = "PRJ|*.prj|DWG|*.dwg|DXF|*.dxf";
            openFileDialog.InitialDirectory = MSCPrj.LocatePRJDirectory();
            openFileDialog.CheckFileExists  = true;
            openFileDialog.CheckPathExists  = true;
            bool   flag = false;
            string text = "";

            do
            {
                if (openFileDialog.ShowDialog() == true)
                {
                    string a = Path.GetExtension(openFileDialog.FileName).ToLower();
                    try
                    {
                        if (a == ".dwg" || a == ".dxf")
                        {
                            Database database = new Database(false, true);
                            database.ReadDwgFile(openFileDialog.FileName, (FileOpenMode)3, true, "");
                            text = MSCPrj.ReadWKT(database);
                            if (string.IsNullOrEmpty(text))
                            {
                                ErrorReport.ShowErrorMessage(AfaStrings.NoValidCoordinateSystemFoundIn + openFileDialog.FileName);
                            }
                        }
                        else if (a == ".prj")
                        {
                            text = File.ReadAllText(openFileDialog.FileName);
                        }
                    }
                    catch
                    {
                        ErrorReport.ShowErrorMessage(AfaStrings.ErrorReadingWKTStringFrom + openFileDialog.FileName);
                    }
                    if (!string.IsNullOrEmpty(text))
                    {
                        flag = true;
                        MSCPrj.AssignWKT(AfaDocData.ActiveDocData.Document, text);
                    }
                }
                else
                {
                    flag = true;
                }
            }while (!flag);
        }