Datagrid

Question

 SqlConnection con = new SqlConnection("Data Source=(local);Initial Catalog=StudentRegistration;Integrated Security=True");

            con.Open();

            SqlCommand cmd = new SqlCommand("select * from StudentInfo",con);

            SqlDataAdapter da = new SqlDataAdapter(cmd);

             DataSet ds = new DataSet();

             da.Fill(ds);

             dataGridView1.DataSource = ds;

             dataGridView1.DataMember = "Student";
why i am getting Object reference not set to an instance of an object in this the code is correct i think.


pls reply guys