The process cannot access the file because it is being used by another process File is created but contains nothing

Question

using System IO   class test       public static void Main                  string path   c  mytext txt            if File Exists path                         File Delete path                       FileStream fs new FileStream path FileMode OpenOrCreate           StreamWriter str new StreamWriter fs           str BaseStream Seek 0 SeekOrigin End            str Write  mytext txt                                     str WriteLine DateTime Now ToLongTimeString       DateTime Now ToLongDateString             string addtext  this line is added  Environment NewLine          File AppendAllText path addtext      Exception occurrs                    string readtext File ReadAllText path           Console WriteLine readtext           str Flush            str Close             Console ReadKey        System IO IOException  The process cannot access the file  c  mytext txt  because it is   being used by another process       at System IO   Error WinIOError Int32 errorCode  String maybeFullPath

User · Answer

using  var fs   new FileStream filePath  FileMode Append  FileAccess Write  FileShare ReadWrite   using  var sw   new StreamWriter fs         sw WriteLine message

User · Answer

Try This  string path     c  mytext txt    if  File Exists path         File Delete path           Consider File Operation 1     FileStream fs   new FileStream path  FileMode OpenOrCreate       StreamWriter str   new StreamWriter fs       str BaseStream Seek 0  SeekOrigin End       str Write  mytext txt                                 str WriteLine DateTime Now ToLongTimeString                              DateTime Now ToLongDateString         string addtext    this line is added    Environment NewLine      str Flush        str Close        fs Close           Close the Stream then Individually you can access the file     File AppendAllText path  addtext       File Operation 2  string readtext   File ReadAllText path      File Operation 3  Console WriteLine readtext     In every File Operation  The File will be Opened and must be Closed prior Opened  Like wise in the Operation 1 you must Close the File Stream for the Further Operations

User · Answer

File AppendAllText does not know about the stream you have opened  so will internally try to open the file again  Because your stream is blocking access to the file  File AppendAllText will fail  throwing the exception you see   I suggest you used str Write or str WriteLine instead  as you already do elsewhere in your code   Your file is created but contains nothing because the exception is thrown before str Flush   and str Close   are called

User · Answer

You are writing to the file prior to closing your filestream   using FileStream fs new FileStream path FileMode OpenOrCreate   using  StreamWriter str new StreamWriter fs        str BaseStream Seek 0 SeekOrigin End       str Write  mytext txt                                str WriteLine DateTime Now ToLongTimeString       DateTime Now ToLongDateString        string addtext  this line is added  Environment NewLine      str Flush        File AppendAllText path addtext      Exception occurrs            string readtext File ReadAllText path   Console WriteLine readtext     The above code should work  using the methods you are currently using   You should also look into the using statement and wrap your streams in a using block

[c#] The process cannot access the file because it is being used by another process (File is created but contains nothing)

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