C#中时间显示为月初那天如何写？

Question

我的程序如下：
 strDate.Attributes.Add("onfocus", "setday(this)");
                DateTime today = DateTime.Now;
                String eDate1 = today.ToString("yyyy-MM-dd");
                String eDate2 = today.ToString("yyyy-MM-dd");
                endDate.Text = eDate1;
                strDate.Text = eDate2;
                endDate.Attributes.Add("onfocus", "setday(this)");现在希望eDate1这里放的是月初的数字，而不是系统当天的日子，该如何写啊？

Answer 1

DateTime today = DateTime.Now;
改成 DateTime time= new DateTime(year(DateTime.Now),1,day(DateTime.Now));

Answer 2

tryDateTime date = System.DateTime.Today.AddDays(1 - System.DateTime.Today.Day);
MessageBox.Show(date.ToShortDateString());

Answer 3

DateTime firstDayThisMonth = DateTime.Now.AddDays(1-DateTime.Now.Day);