C# super practical code snippet collection

using System;
using ;
using ;
using ;
using ;
using ;
using ;
using ;
namespace notifyIconShow
{
 public partial class notifyIconShow : Form
 {
  public notifyIconShow()
  {
   InitializeComponent();
  }
  #region//Set the text on the mouse on the tray icon  /// <summary>
  /// Method name: notifyIconShow_Load (form load event)  /// Method function: Set the text on the mouse on the tray icon  /// Date of completion: May 16, 2010  /// Author: Xinyu  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void notifyIconShow_Load(object sender, EventArgs e)
  {
   //Set the text on the mouse on the tray icon   this. = "Heart language tray icon";
  }
  #endregion
  #region//Create objects and declare variables //Create NotifyIcon object  NotifyIcon notifyicon = new NotifyIcon();
  //Create a tray icon object  Icon ico = new Icon("");
  //Create a tray menu object  ContextMenu notifyContextMenu = new ContextMenu();
  #endregion
  #region//Hide the taskbar icon and show the tray icon  /// <summary>
  /// Method name: notifyIconShow_SizeChanged (event after the form size changes)  /// Method function: Hide the taskbar icon and display the tray icon  /// Date of completion: May 16, 2010  /// Author: Xinyu  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void notifyIconShow_SizeChanged(object sender, EventArgs e)
  {
   //Judge whether the minimize button is selected   if (WindowState == )
   {
    //The tray display icon is equal to the tray icon object    //Note that notifyIcon1 is the name of the control rather than the name of the object     = ico;
    //Hide the taskbar area icon     = false;
    //The icon is displayed in the tray area     = true;
   }
  }
  #endregion
  #region//Restore form  /// <summary>
  /// Method name: notifyIcon1_Click (tray icon click)  /// Method function: Restore the form  /// Date of completion: May 16, 2010  /// Author: Xinyu  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void notifyIcon1_Click(object sender, EventArgs e)
  {
   //Judge whether it has been minimized to the pallet   if (WindowState == )
   {
    //Restore the form display    WindowState = ;
    //Activate the form and give it focus    ();
    //Taskbar area display icon     = true;
    //The tray area icon is hidden     = false;
   }
  }
  #endregion
 }
}

class Program
{
  static void Main(string[] args)
  {
   int n = m(20, 15);
   ("The minimum common multiple is:" + ());
   ();
  }
  static int f(int a, int b)//The greatest common divisor  {
   if (a < b) { a = a + b; b = a - b; a = a - b; }
   return (a % b == 0) ? b : f(a % b, b);
  }
  static int m(int a, int b)//The minimum common multiple  {
   return a * b / f(a, b);
  }
}

/// <summary> 
/// Convert Chinese characters to pinyin (full spelling)/// </summary> 
/// <param name="hzString">Chinese character string</param>/// <returns>Converted Pinyin (full spelling) string</returns>public static string ConvertE(string hzString)
{
 // Match Chinese characters Regex regex = new Regex("^[\u4e00-\u9fa5]$");
 byte[] array = new byte[2];
 string pyString = "";
 int chrAsc = 0;
 int i1 = 0;
 int i2 = 0;
 char[] noWChar = ();
 for (int j = 0; j &lt; ; j++)
 {
  // Chinese characters  if ((noWChar[j].ToString()))
  {
   array = (noWChar[j].ToString());
   i1 = (short)(array[0]);
   i2 = (short)(array[1]);
   chrAsc = i1 * 256 + i2 - 65536;
   if (chrAsc &gt; 0 &amp;&amp; chrAsc &lt; 160)
   {
    pyString += noWChar[j];
   }
   else
   {
    // Modify some text    if (chrAsc == -9254) // Correct the word "Zhen"     pyString += "Zhen";
    else
    {
     for (int i = ( - 1); i &gt;= 0; i--)
     {
      if (pyValue[i] &lt;= chrAsc)
      {
       pyString += pyName[i];
       break;
      }
     }
    }
   }
  }
  // Non-Chinese characters  else
  {
   pyString += noWChar[j].ToString();
  }
 }
 return pyString;
}
private static int[] pyValue = new int[] 
{ 
 -20319,-20317,-20304,-20295,-20292,-20283,-20265,-20257,-20242,-20230,-20051,-20036, 
 -20032,-20026,-20002,-19990,-19986,-19982,-19976,-19805,-19784,-19775,-19774,-19763, 
 -19756,-19751,-19746,-19741,-19739,-19728,-19725,-19715,-19540,-19531,-19525,-19515, 
 -19500,-19484,-19479,-19467,-19289,-19288,-19281,-19275,-19270,-19263,-19261,-19249, 
 -19243,-19242,-19238,-19235,-19227,-19224,-19218,-19212,-19038,-19023,-19018,-19006, 
 -19003,-18996,-18977,-18961,-18952,-18783,-18774,-18773,-18763,-18756,-18741,-18735, 
 -18731,-18722,-18710,-18697,-18696,-18526,-18518,-18501,-18490,-18478,-18463,-18448, 
 -18447,-18446,-18239,-18237,-18231,-18220,-18211,-18201,-18184,-18183, -18181,-18012, 
 -17997,-17988,-17970,-17964,-17961,-17950,-17947,-17931,-17928,-17922,-17759,-17752, 
 -17733,-17730,-17721,-17703,-17701,-17697,-17692,-17683,-17676,-17496,-17487,-17482, 
 -17468,-17454,-17433,-17427,-17417,-17202,-17185,-16983,-16970,-16942,-16915,-16733, 
 -16708,-16706,-16689,-16664,-16657,-16647,-16474,-16470,-16465,-16459,-16452,-16448, 
 -16433,-16429,-16427,-16423,-16419,-16412,-16407,-16403,-16401,-16393,-16220,-16216, 
 -16212,-16205,-16202,-16187,-16180,-16171,-16169,-16158,-16155,-15959,-15958,-15944, 
 -15933,-15920,-15915,-15903,-15889,-15878,-15707,-15701,-15681,-15667,-15661,-15659, 
 -15652,-15640,-15631,-15625,-15454,-15448,-15436,-15435,-15419,-15416,-15408,-15394, 
 -15385,-15377,-15375,-15369,-15363,-15362,-15183,-15180,-15165,-15158,-15153,-15150, 
 -15149,-15144,-15143,-15141,-15140,-15139,-15128,-15121,-15119,-15117,-15110,-15109, 
 -14941,-14937,-14933,-14930,-14929,-14928,-14926,-14922,-14921,-14914,-14908,-14902, 
 -14894,-14889,-14882,-14873,-14871,-14857,-14678,-14674,-14670,-14668,-14663,-14654, 
 -14645,-14630,-14594,-14429,-14407,-14399,-14384,-14379,-14368,-14355,-14353,-14345, 
 -14170,-14159,-14151,-14149,-14145,-14140,-14137,-14135,-14125,-14123,-14122,-14112, 
 -14109,-14099,-14097,-14094,-14092,-14090,-14087,-14083,-13917,-13914,-13910,-13907, 
 -13906,-13905,-13896,-13894,-13878,-13870,-13859,-13847,-13831,-13658,-13611,-13601, 
 -13406,-13404,-13400,-13398,-13395,-13391,-13387,-13383,-13367,-13359,-13356,-13343, 
 -13340,-13329,-13326,-13318,-13147,-13138,-13120,-13107,-13096,-13095,-13091,-13076, 
 -13068,-13063,-13060,-12888,-12875,-12871,-12860,-12858,-12852,-12849,-12838,-12831, 
 -12829,-12812,-12802,-12607,-12597,-12594,-12585,-12556,-12359,-12346,-12320,-12300, 
 -12120,-12099,-12089,-12074,-12067,-12058,-12039,-11867,-11861,-11847,-11831,-11798, 
 -11781,-11604,-11589,-11536,-11358,-11340,-11339,-11324,-11303,-11097,-11077,-11067, 
 -11055,-11052,-11045,-11041,-11038,-11024,-11020,-11019,-11018,-11014,-10838,-10832, 
 -10815,-10800,-10790,-10780,-10764,-10587,-10544,-10533,-10519,-10331,-10329,-10328, 
 -10322,-10315,-10309,-10307,-10296,-10281,-10274,-10270,-10262,-10260,-10256,-10254 
};
private static string[] pyName = new string[] 
{ 
 "A","Ai","An","Ang","Ao","Ba","Bai","Ban","Bang","Bao","Bei","Ben", 
 "Beng","Bi","Bian","Biao","Bie","Bin","Bing","Bo","Bu","Ba","Cai","Can", 
 "Cang","Cao","Ce","Ceng","Cha","Chai","Chan","Chang","Chao","Che","Chen","Cheng", 
 "Chi","Chong","Chou","Chu","Chuai","Chuan","Chuang","Chui","Chun","Chuo","Ci","Cong", 
 "Cou","Cu","Cuan","Cui","Cun","Cuo","Da","Dai","Dan","Dang","Dao","De", 
 "Deng","Di","Dian","Diao","Die","Ding","Diu","Dong","Dou","Du","Duan","Dui", 
 "Dun","Duo","E","En","Er","Fa","Fan","Fang","Fei","Fen","Feng","Fo", 
 "Fou","Fu","Ga","Gai","Gan","Gang","Gao","Ge","Gei","Gen","Geng","Gong", 
 "Gou","Gu","Gua","Guai","Guan","Guang","Gui","Gun","Guo","Ha","Hai","Han", 
 "Hang","Hao","He","Hei","Hen","Heng","Hong","Hou","Hu","Hua","Huai","Huan", 
 "Huang","Hui","Hun","Huo","Ji","Jia","Jian","Jiang","Jiao","Jie","Jin","Jing", 
 "Jiong","Jiu","Ju","Juan","Jue","Jun","Ka","Kai","Kan","Kang","Kao","Ke", 
 "Ken","Keng","Kong","Kou","Ku","Kua","Kuai","Kuan","Kuang","Kui","Kun","Kuo", 
 "La","Lai","Lan","Lang","Lao","Le","Lei","Leng","Li","Lia","Lian","Liang", 
 "Liao","Lie","Lin","Ling","Liu","Long","Lou","Lu","Lv","Luan","Lue","Lun", 
 "Luo","Ma","Mai","Man","Mang","Mao","Me","Mei","Men","Meng","Mi","Mian", 
 "Miao","Mie","Min","Ming","Miu","Mo","Mou","Mu","Na","Nai","Nan","Nang", 
 "Nao","Ne","Nei","Nen","Neng","Ni","Nian","Niang","Niao","Nie","Nin","Ning", 
 "Niu","Nong","Nu","Nv","Nuan","Nue","Nuo","O","Ou","Pa","Pai","Pan", 
 "Pang","Pao","Pei","Pen","Peng","Pi","Pian","Piao","Pie","Pin","Ping","Po", 
 "Pu","Qi","Qia","Qian","Qiang","Qiao","Qie","Qin","Qing","Qiong","Qiu","Qu", 
 "Quan","Que","Qun","Ran","Rang","Rao","Re","Ren","Reng","Ri","Rong","Rou", 
 "Ru","Ruan","Rui","Run","Ruo","Sa","Sai","San","Sang","Sao","Se","Sen", 
 "Seng","Sha","Shai","Shan","Shang","Shao","She","Shen","Sheng","Shi","Shou","Shu", 
 "Shua","Shuai","Shuan","Shuang","Shui","Shun","Shuo","Si","Song","Sou","Su","Suan", 
 "Sui","Sun","Suo","Ta","Tai","Tan","Tang","Tao","Te","Teng","Ti","Tian", 
 "Tiao","Tie","Ting","Tong","Tou","Tu","Tuan","Tui","Tun","Tuo","Wa","Wai", 
 "Wan","Wang","Wei","Wen","Weng","Wo","Wu","Xi","Xia","Xian","Xiang","Xiao", 
 "Xie","Xin","Xing","Xiong","Xiu","Xu","Xuan","Xue","Xun","Ya","Yan","Yang", 
 "Yao","Ye","Yi","Yin","Ying","Yo","Yong","You","Yu","Yuan","Yue","Yun", 
 "Za", "Zai","Zan","Zang","Zao","Ze","Zei","Zen","Zeng","Zha","Zhai","Zhan", 
 "Zhang","Zhao","Zhe","Zhen","Zheng","Zhi","Zhong","Zhou","Zhu","Zhua","Zhuai","Zhuan", 
 "Zhuang","Zhui","Zhun","Zhuo","Zi","Zong","Zou","Zu","Zuan","Zui","Zun","Zuo" 
};

//Import this namespaceusing ;
Stopwatch watch=new Stopwatch ();
();
/*
 Here is the running code to be calculated
 */
();
//Get the total running time (in milliseconds) measured by the current instancestring time = ();

protected void Page_Load(object sender, EventArgs e)
{
    int m = ;
    int y = ;
    int d = ;
    int weeks = getWeekDay(y, m, d);
    switch (weeks)
    {
      case 1:
        this. = "Monday";
        break;
      case 2:
        this. = "Tuesday";
        break;
      case 3:
        this. = "Wednesday";
        break;
      case 4:
        this. = "Thursday";
        break;
      case 5:
        this. = "Friday";
        break;
      case 6:
        this. = "Saturday";
        break;
      case 7:
        this. = "Sunday";
        break;
    }
}
/// <summary>Get the day of the week based on the date</summary>/// <param name="y">year</param>/// <param name="m">month</param>/// <param name="d">Day</param>/// <returns>Day of the week, 1 represents Monday; 7 represents Sunday</returns>public static int getWeekDay(int y, int m, int d)
{
    if (m == 1) m = 13;
    if (m == 2) m = 14;
    int week = (d + 2 * m + 3 * (m + 1) / 5 + y + y / 4 - y / 100 + y / 400) % 7 + 1;
    return week;
}

/// <summary>
/// C# Delete folder/// Usage: DeleteFolder(@"c:\\1");/// </summary>
/// <param name="dir"></param>
private static void DeleteFolder(string dir)
{
  // Loop the contents in the folder  foreach (string f in (dir))
  {
  // If the file exists  if ((f))
  {
  FileInfo fi = new FileInfo(f);
  if (().IndexOf("Readonly") != 1)
  {
   = ;
  }
  // Delete the files directly  (f);
  }
  else
  {
  // If the folder exists  // Recursively delete subfolders  DeleteFolder(f);
  }
  }
  // Delete empty folders  (dir);
}