Specified Cast is not Vaild

Hi,
I am trying to implement the custom tool option page.

http://blogs.msdn.com/jim_glass/archive/2005/02/14/372319.aspx

I am working on tool option page.I created a custom page in the tool option successfully.Now I am trying to use the settings from my custom page to some other package.When i am running this code is giving me " Specified Cast is not Vaild " . I am not able to figure it out why its happening.One  more thing when I am trying with

EnvDTE.Properties props = dte.get_Properties("Environment", "Documents");

Its working fine.
But ..
 

EnvDTE.Properties props1 = dte.get_Properties("My Options Page (C#)", "General");

is not working.
The Code is

private void MenuItemCallback(object sender, EventArgs e)
        {

            DTE dte = (EnvDTE.DTE)GetService(typeof(DTE)) as DTE;
                if (dte != null)
                {
                    EnvDTE.Properties props = dte.get_Properties("Environment", "Documents");
                    MessageBox.Show("OptionInteger: " + props.Count.ToString());
                    EnvDTE.Properties props1 = dte.get_Properties("My Options Page (C#)", "General");\\Getting Error
                  
                }
                  
        }