timers.md

+## .NET Timer의 종류 
+- System.Threading.Timer
+- System.Timers.Timer
+- System.Windows.Forms.Timer 
+- System.Windows.Threading.DispatcherTimer 
+
+
+| 클래스 | 스레드 종류 |
+| -------------- | ----------- |
+|  System.Threading.Timer | Woker Thread |
+| System.Timers.Timer | Woker Thread or UI Thread |
+| System.Windows.Forms.Timer | UI Thread |
+| SySystem.Windows.Threading.DispatcherTimer | UI Thread |
+
+### 사용 방법
+#### System.Threading.Timer
+```csharp
+System.Threading.Timer stateTimer = new System.Threading.Timer(callback, null, 1000, 250);
+```
+
+#### System.Timers.Timer
+```csharp
+System.Timers.Timer timer = new System.Timers.Timer();
+timer.Interval = 1000;
+timer.Elapsed += new ElapsedEventHandler(timer_Elapsed);
+timer.Start();
+```
+
+#### System.Windows.Forms.Timer
+```csharp
+Timer timer = new System.Windows.Forms.Timer();
+timer.Interval = 1000; 
+timer.Tick += new EventHandler(timer_Tick);
+timer.Start();
+```
+
+#### SySystem.Windows.Threading.DispatcherTimer
+```csharp
+DispatcherTimer dispatcherTimer = new DispatcherTimer();
+dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
+dispatcherTimer.Interval = new TimeSpan(0, 0, 1);
+dispatcherTimer.Start();
+```
+
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