System.IO.IOException：プロセスが別のプロセスで使用されているため、ファイル 'C：\ RDS \ RDS.txt'にアクセスできません。

Question

アプリケーションの実行後、このエラーメッセージが表示されます。どうして？あなたの答えを教えてくれたら嬉しいです。ここ

は私のForm1のソースコードです：https://github.com/betimen/txtRDS/blob/master/Form1.cs

（エラーメッセージ）

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& 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: 
<configuration> 
<system.windows.forms jitDebugging="true" /> 
</configuration> 
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. 

Answer 1

あなたは別のアプリケーションで開かれたテキストファイルを持っていますか？テキストファイルが開かれているプログラムがアクセスしないように思えます。これは、どのアプリケーションがそれをしているかを知ることができます：
http://www.techsupportalert.com/content/how-find-out-which-windows-process-using-file.htm