How to insert current time on gridview in asp.net?

using System;
using System.Data;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
  public class Form1 : Form
  {
    DataGridView dgv = new DataGridView();
    public Form1()
    {
      this.Controls.Add(dgv);
      DataTable dt = new DataTable();
      dt.Columns.Add("Current Time", typeof(DateTime));
      dt.Rows.Add(new object[] { DateTime.Now });
      dgv.DataSource = dt;
      dgv.Columns[0].DefaultCellStyle.Format = "HH:mm:ss";
    }
  }
}