Unhandled Exception in visio

[nithya176]

Hey guys, Im gettin an exception when i run this code. This code is taken from a VB code which is basically to create an add-in in visio using c#

private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
            Microsoft.Office.Core.CommandBars commandBars;
            Microsoft.Office.Core.CommandBar commandBar;
 
            commandBars =(Microsoft.Office.Core.CommandBars)Application.CommandBars;
            commandBar = commandBars.Add("Demo Toolbar",Office.MsoBarPosition.msoBarTop,"",true);
            //set the context menu when the toolbar is visible.
            commandBar.Context = Visio.VisUIObjSets.visUIObjSetDrawing + "*";
 
            //add a button wth a smiley face icon
 
            Microsoft.Office.Core.CommandBarButton DemoButton = (Microsoft.Office.Core.CommandBarButton)commandBar.Controls.Add(Microsoft.Office.Core.MsoControlType.msoControlButton,2950,"","","");
            DemoButton.Tag = "Demo Button";
            DemoButton.FaceId = 2950;
            DemoButton.TooltipText= "Run Demo";
 
 
 
        }

[kenobewan]

Please post the exception. Thanks.