IO Exception. File Watcher Program

Hi, what i am doing is to create a dir watcher which will watch the dir for example "A" and copy the file of certain name to another folder once it sees the file in the dir A to destination dir B. I dropped the file to the Dir A and it worked. but when i ran the program in my local machine and set dir to be watched and destination dir in server, it throws me the following error.

How do i handle it?

Unhandled Exception: System.IO.IOException: The process cannot access the file '\\IP-exapp-101\c$\WorkDir\WatchedDir\_f$12345.dat' because it is being used by another process.

at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

at System.IO.File.InternalCopy(String sourceFileName, String destFileName, Boolean overwrite, Boolean checkHost)

at System.IO.File.Copy(String sourceFileName, String destFileName)

at iSpy_File.Program.OnChanged(Object source, FileSystemEventArgs e) in c:\users\xuser\documents\visual studio 2015\Projects\iSpy_File\iSpy_File\Program.cs:line 68

at System.IO.FileSystemWatcher.OnCreated(FileSystemEventArgs e)

at System.IO.FileSystemWatcher.NotifyFileSystemEventArgs(Int32 action, String name)

at System.IO.FileSystemWatcher.CompletionStatusChanged(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* overlappedPointer)

at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)

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my code:

public static void Run()

{

string[] args = System.Environment.GetCommandLineArgs();

// If a directory is not specified, exit program.

if (args.Length != 3)

{

// Display the proper way to call the program.

Console.WriteLine("Please Provide Source and destination directory: iSpy_Folder.exe ");

return;

}

// Create a new FileSystemWatcher and set its properties.

FileSystemWatcher watcher = new FileSystemWatcher();

watcher.Path = args[1];

/* Watch for changes in LastAccess and LastWrite times, and

the renaming of files or directories. */

watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite

| NotifyFilters.FileName | NotifyFilters.DirectoryName;

// Only watch text files.

watcher.Filter = "*.*";

//// will track changes in sub-folders as well

watcher.IncludeSubdirectories = true;

// Add event handlers.

// watcher.Changed += new FileSystemEventHandler(OnChanged);

watcher.Created += new FileSystemEventHandler(OnChanged);

// watcher.Deleted += new FileSystemEventHandler(OnChanged);

// watcher.Renamed += new RenamedEventHandler(OnRenamed);

// Begin watching.

watcher.EnableRaisingEvents = true;

// Wait for the user to quit the program.

Console.WriteLine("Press \'q\' to quit Program.");

while (Console.Read() != 'q') ;

}

// Define the event handlers.

private static void OnChanged(object source, FileSystemEventArgs e)

{

string[] args = System.Environment.GetCommandLineArgs();

// Specify what is done when a file is changed, created, or deleted.

Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);

if ("_F$"== e.FullPath.Substring(e.FullPath.LastIndexOf("\\")+1, 3).ToUpper())

{

if (File.Exists(e.FullPath))

{

File.Copy(e.FullPath, args[2] + "\\" + e.FullPath.Substring(e.FullPath.LastIndexOf("\\")));

Console.WriteLine("File Copied");

}