How to access data in an object in C#

How to access data in an object in C#

I want to pass the data in a datagridview to another form to do some
processing ... I have tried getting that object into the new form by
passing it as a parameter but after that I don't know how to access the
data inside that object . I want to access the data column wise as they
were inside the datagridview . If somebody can help me with this it would
be great .