How to get previous day using datetime in C#.net

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace adi.Web
{
    public partial class WebForm4 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            DateTime yesterday = DateTime.Now.Date.AddDays(-1);
        }
    }
}