How can I access to menu and sub menu on anther application from my c# application?

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C#

Windows

application

I'm trying to automate an application. I can send text to a text control and send enter key after wrote my text.
Now I want to access menu bar and sub menu such as select file/open and select file to open.
How I do it?
Notice: I'm using Spy++ to get class name and other properties of controls, but menu bar do not have any class name.