How will I bind data to datagridview using objects/classes?

You can add the object returned by method to a list.
Then bind the list to the DataSource property of grid.

(make sure the object you are returning is a class and have properties - so that the grid can generate column headers dynamically)

Eg:
Place a datagridview control on a windows forms application - form and use the following code

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            IList list = new ArrayList();
            list.Add(GetObject());

            dataGridView1.DataSource = list;
        }

        private TestClass GetObject()
        {
            return new TestClass() { Id = 100 };
        }


        public class TestClass
        {
            public int Id
            {
                get;
                set;
            }
        }
    }