void fill_products()
    {
            con.Open();
            cmd.CommandText = "select * from student";
            cmd.Connection = con;
            SqlDataAdapter adp = new SqlDataAdapter();
            adp.SelectCommand = cmd;
            DataSet ds = new DataSet();
            adp.Fill(ds);
            DataGrid2.DataSource = ds.Tables[0];
            DataGrid2.DataBind();
            con.Close();
      }

protected void DataGrid2_ItemDataBound(object sender, DataGridItemEventArgs e)
    {
        int mark;
        mark = Convert.ToInt16(DataBinder.Eval(e.Item.DataItem, "mark"));
        if (mark > 60)
        {
            e.Item.BackColor = System.Drawing.Color.AliceBlue;  // formatting entire row
            e.Item.Cells[2].BackColor = System.Drawing.Color.Crimson; //format only a particular cell
        }
    }