Copy all data from datagridview to another datagridview

Question

I have created a windows form(C#), in which i have two datagridview . 

datagridview1 has 7 columns (Like Sr.no, Name, Class,Div,Rank,Age,City) 

and datagridview2 has 4 column(Like Sr.no, Name, Class,City) 

i want to copy all the data from the datagridview1 to datagridview2 by a button click, in such a way that my datagridview2 displays all the data from datagridview1.