Access Datagridview's Value Of Third Application By My Application

I am developing a project in which i have to access datagridview's value into my application

Now i am able to get the handler of window
i am also get able to handler of datagridview.
i am used findwindow & findwindowex functions

Now i want some guidelines :-
1.How i can access Column Count
2.How i can access row Count
3.How i can access values of datagridview

for listview there are built in class in win32 named as syslistview32
Is there any class for Datagridview?

Or By which Window class handle datagridview?

Or tell any other way to access datagridview values of Third Application By My Application.