>I created a form and a grid on it and there is a separate class file too in the project.
>Can I reference to the grid from the class file? If I can, how?
>Thanks

As Marc suggests you can do something like this:

public class ClassAccessingGrid
    {
        private DataGridView _theGrid;

        public ClassAccessingGrid(DataGridView theGrid)
        {
            _theGrid = theGrid;
        }
    }

and in the form:

private ClassAccessingGrid _caf;
        public Form1()
        {
            InitializeComponent();
            _caf= new ClassAccessingGrid(this.NameofTheGrid);
        }

But what does (or will) the class actually do ?