public void OpenSheetSet()
        {
            // User Input: editor equals command line
            // To talk to the user you use the command line, aka the editor
            Editor ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;

            PromptStringOptions pso = new PromptStringOptions("\nHello Nadia! \nWhat Sheet Set would you like to open?");

            pso.DefaultValue    = @"C:\Users\rhale\Documents\AutoCAD Sheet Sets\Squid666.dst";
            pso.UseDefaultValue = true;
            pso.AllowSpaces     = true;
            PromptResult pr = ed.GetString(pso);

            // Get a reference to the Sheet Set Manager object
            IAcSmSheetSetMgr sheetSetManager = default(IAcSmSheetSetMgr);

            sheetSetManager = new AcSmSheetSetMgr();

            // Open a Sheet Set file
            AcSmDatabase sheetSetDatabase = default(AcSmDatabase);

            //sheetSetDatabase = sheetSetManager.OpenDatabase(@"C:\Users\Robert\Documents\AutoCAD Sheet Sets\Expedia.dst", false);
            sheetSetDatabase = sheetSetManager.OpenDatabase(pr.StringResult, false);

            // Return the namd and description of the sheet set
            MessageBox.Show("Sheet Set Name: " + sheetSetDatabase.GetSheetSet().GetName() + "\nSheet Set Description: " + sheetSetDatabase.GetSheetSet().GetDesc());

            // Close the sheet set
            sheetSetManager.Close(sheetSetDatabase);
        }
 internal SheetSetMgr()
 {
     _sheetSetMgr = new AcSmSheetSetMgr();
 }