DateTime.Now.ToString()方法

 //2007年4月24日

        this.TextBox1.Text = System.DateTime.Now.ToString("D");

        //2007/4/24

        this.TextBox2.Text = System.DateTime.Now.ToString("d");

       //2007年4月24日 16:30:15

        this.TextBox3.Text = System.DateTime.Now.ToString("F");

        //2007年4月24日 16:30

        this.TextBox4.Text = System.DateTime.Now.ToString("f");

        //2007/4/24 16:30:15

        this.TextBox5.Text = System.DateTime.Now.ToString("G");

        //2007/4/24 16:30       

       this.TextBox6.Text = System.DateTime.Now.ToString("g");

        //16:30:15

        this.TextBox7.Text = System.DateTime.Now.ToString("T");

        //16:30

        this.TextBox8.Text = System.DateTime.Now.ToString("t");

        //2007年4月24日 8:30:15

        this.TextBox9.Text = System.DateTime.Now.ToString("U");

        //2007-04-24 16:30:15Z

this.TextBox10.Text = System.DateTime.Now.ToString("u");

        //4月24日   

        this.TextBox11.Text = System.DateTime.Now.ToString("m");

        this.TextBox12.Text = System.DateTime.Now.ToString("M");

        //Tue, 24 Apr 2007 16:30:15 GMT

        this.TextBox13.Text = System.DateTime.Now.ToString("r");

        this.TextBox14.Text = System.DateTime.Now.ToString("R");

        //2007年4月

        this.TextBox15.Text = System.DateTime.Now.ToString("y");

        this.TextBox16.Text = System.DateTime.Now.ToString("Y");

       //2007-04-24T15:52:19.1562500+08:00

        this.TextBox17.Text = System.DateTime.Now.ToString("o");

        this.TextBox18.Text = System.DateTime.Now.ToString("O");

        //2007-04-24T16:30:15

        this.TextBox19.Text = System.DateTime.Now.ToString("s");

       //2007-04-24 15:52:19:9889

        this.TextBox20.Text = System.DateTime.Now.ToString("yyyy-MM-dd HH：mm：ss：ffff");

        //2007年04月24 15时56分48秒

        this.TextBox21.Text = System.DateTime.Now.ToString("yyyy年MM月dd HH时mm分ss秒");

        //星期二, 四月 24 2007

        this.TextBox22.Text = System.DateTime.Now.ToString("dddd, MMMM dd yyyy");

       //周三, 十二月 7 '11

        this.TextBox23.Text = System.DateTime.Now.ToString("ddd, MMM d \"'\"yy");

        //星期二, 四月 24

        this.TextBox24.Text = System.DateTime.Now.ToString("dddd, MMMM dd");

        //4/07

        this.TextBox25.Text = System.DateTime.Now.ToString("M/yy");

        //07-12-11

        this.TextBox26.Text = System.DateTime.Now.ToString("dd-MM-yy");

      

        string[] Day = new string[] { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };

        //2011/12/6 昨天

        this.TextBox1.Text = System.DateTime.Now.AddDays(-1).ToShortDateString();

        //2011/12/8 明天

        this.TextBox2.Text = DateTime.Now.AddDays(1).ToShortDateString();

       //2011/12/4 本周星期天

        this.TextBox3.Text = DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek)))).ToShortDateString();

        //2011/12/10 本周星期六

        this.TextBox4.Text = DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek)))).ToShortDateString();

       //星期三 今天周几

        this.TextBox5.Text = Day[Convert.ToInt16(DateTime.Now.DayOfWeek)];

        //2011/11/27 上周日

        this.TextBox6.Text = DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek))) - 7).ToShortDateString();

        //2011/12/3 上周六

        this.TextBox7.Text = DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek))) - 7).ToShortDateString();

       //2011/12/11 下周日

        this.TextBox8.Text = DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek))) + 7).ToShortDateString();

        //2011/12/17 下周六

        this.TextBox9.Text = DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek))) + 7).ToShortDateString();

        //2011-12-01 本月一号

        this.TextBox10.Text =DateTime.Now.ToString("yyyy-MM-01");

        //2011/12/31 本月最后一天

        this.TextBox11.Text=DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01")).AddMonths(1).AddDays(-1).ToShortDateString();

        //2011/11/1 上个月一号

        this.TextBox12.Text=System.DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01")).AddMonths(-1).ToShortDateString();

        //2012/1/1 下个月一号

        this.TextBox13.Text=System.DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01")).AddMonths(1).ToShortDateSring();

 /// <summary>        

/// 将byte型转换为字符串      

   /// </summary>        

/// <param name="arrInput">byte型数组</param>   

      /// <returns>目标字符串</returns>        

private string ByteArrayToString(byte[] arrInput)       

  {           

  int i;         

    StringBuilder sOutput = new StringBuilder(arrInput.Length);    

         for (i = 0; i < arrInput.Length; i++)       

      {                

sOutput.Append(arrInput[i].ToString("X2"));       

       }             //将此实例的值转换为System.String       

      return sOutput.ToString();    

     }

 /// <summary>

 /// 对接收到的数据进行解包（将接收到的byte型数组解包为Unicode字符串）

  /// </summary>       

  /// <param name="recbytes">byte型数组</param>      

   /// <returns>Unicode编码的字符串</returns>        

public string disPackage(byte[] recbytes)      

   {         

    string temp = "";  

    foreach (byte b in recbytes)     

      temp += b.ToString("X2") + " ";  //ToString("X2") 为C#中的字符串格式控制符        

     return temp;         }

======================================================

ToString("X2") 为C#中的字符串格式控制符

X为     十六进制 2为     每次都是两位数

比如   0x0A ，若没有2,就只会输出0xA 假设有两个数10和26，正常情况十六进制显示0xA、0x1A，这样看起来不整齐，为了好看，可以指定"X2"，这样显示出来就是：0x0A、0x1A。 参考网址： http://topic.csdn.net/t/20050709/17/4133902.html