title: System.IO.IOException: The process cannot access the file 'C:\RDS\RDS.txt' because it is being used by another process
body: <p>after running my application, i have this error message minutes later. why? i will be appreciated if you help me with your answers.</p>
  
  <p>here is the source code of my Form1: <a href="https://github.com/betimen/txtRDS/blob/master/Form1.cs" rel="nofollow noreferrer">https://github.com/betimen/txtRDS/blob/master/Form1.cs</a></p>
  
  <p>(ERROR MESSAGE)</p>
  
  <pre><code>See the end of this message for details on invoking 
  just-in-time (JIT) debugging instead of this dialog box.
  ************** Exception Text **************
  System.IO.IOException: The process cannot access the file 'C:\RDS\RDS.txt' because it is being used by another process.
  at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
  at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
  at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
  at System.IO.StreamWriter.CreateFile(String path, Boolean append, Boolean checkHost)
  at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize, Boolean checkHost)
  at System.IO.StreamWriter..ctor(String path)
  at WindowsFormsApplication2.Form1.timer1_Tick(Object sender, EventArgs e)
  at System.Windows.Forms.Timer.OnTick(EventArgs e)
  at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message&amp; m)
  at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
  ************** Loaded Assemblies **************
  mscorlib
  Assembly Version: 4.0.0.0
  Win32 Version: 4.5.27.0 built by: FX453PREVIEWREL
  CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
  ----------------------------------------
  txtRDS
  Assembly Version: 1.0.0.0
  Win32 Version: 1.0.0.0
  CodeBase: file:///C:/Users/hevi%20sms/Downloads/txtRDS.exe
  ----------------------------------------
  System.Windows.Forms
  Assembly Version: 4.0.0.0
  Win32 Version: 4.5.27.0 built by: FX453PREVIEWREL
  CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
  ----------------------------------------
  System
  Assembly Version: 4.0.0.0
  Win32 Version: 4.5.27.0 built by: FX453PREVIEWREL
   CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
  ----------------------------------------
  System.Drawing
  Assembly Version: 4.0.0.0
  Win32 Version: 4.5.27.0 built by: FX453PREVIEWREL
  CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
  ----------------------------------------
  Accessibility
  Assembly Version: 4.0.0.0
  Win32 Version: 4.5.27.0 built by: FX453PREVIEWREL
  CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Accessibility/v4.0_4.0.0.0__b03f5f7f11d50a3a/Accessibility.dll
  ----------------------------------------
  System.Configuration
  Assembly Version: 4.0.0.0
  Win32 Version: 4.5.27.0 built by: FX453PREVIEWREL
  CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
  ----------------------------------------
  System.Xml
  Assembly Version: 4.0.0.0
  Win32 Version: 4.5.27.0 built by: FX453PREVIEWREL
  CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
  ----------------------------------------
  ************** JIT Debugging **************
  To enable just-in-time (JIT) debugging, the .config file for this
  application or computer (machine.config) must have the
  jitDebugging value set in the system.windows.forms section.
  The application must also be compiled with debugging
  enabled.
  For example:
  &lt;configuration&gt;
  &lt;system.windows.forms jitDebugging="true" /&gt;
  &lt;/configuration&gt;
  When JIT debugging is enabled, any unhandled exception
  will be sent to the JIT debugger registered on the computer
  rather than be handled by this dialog box.
  </code></pre>