Directory.Delete expires the session [SOLVED]

Yet another frustrating error. That when you delete a directory the session gets expired automatically.
This is a known issue and is actually a default behavior and is defined in following words.
It is the default nature if you are deleting a subdirectory within your application, your app domain will restart. This removes all session data.
How to overcome this issue?
Here are the 3 possible solutions for this issue.

Solution 1:

Make your directory outside application directory.
Here is the explanation how to use the directory which is outside. I got this solution from the given link as well.
http://stackoverflow.com/questions/502743/asp-net-deleting-a-directory-results-in-application-restart

Solution 2:

Don't delete the directory but only delete files in directory and sub directories. This will at least release the memory. Here is my function to Delete all files (and not directories). Simply call it instead of the Directory.Delete Statement.

VB

Private Sub DeleteFiles(pDirectoryPath As String)

   For Each mFile In System.IO.Directory.GetFiles(pDirectoryPath)

       System.IO.File.Delete(mFile)

   Next

   For Each mDirectory In System.IO.Directory.GetDirectories(pDirectoryPath)

       DeleteFiles(mDirectory)

   Next

End Sub

CSharp (C#)

    private void DeleteFiles(string pDirectoryPath)

{

       foreach (object mFile_loopVariable in System.IO.Directory.GetFiles(pDirectoryPath)) {

              mFile = mFile_loopVariable;

              System.IO.File.Delete(mFile);

       }

       foreach (object mDirectory_loopVariable in System.IO.Directory.GetDirectories(pDirectoryPath)) {

              mDirectory = mDirectory_loopVariable;

              DeleteFiles(mDirectory);

       }

}

I am not stealing the credits for this solution. I got the idea of this from following article and then made my own function with little bit of modifications

http://www.vikramlakhotia.com/Deleting_Directory_in_ASPnet_20.aspx

Solution 3:

This will work for your local system and for dedicated/virtually dedicated hosting and for only those shared hosting which allow you to run your application/website in full trust mode.

You have to add following function in your code and then have to call it before you use the Directory.Delete method.

VB

Private Sub FixAppDomainRestartWhenTouchingFiles()

        Dim p As System.Reflection.PropertyInfo = GetType(HttpRuntime).GetProperty("FileChangesMonitor", Reflection.BindingFlags.Public Or Reflection.BindingFlags.NonPublic Or Reflection.BindingFlags.Static)

        Dim o As Object = p.GetValue(Nothing, Nothing)

        Dim f As System.Reflection.FieldInfo = o.GetType.GetField("_dirMonSubdirs", Reflection.BindingFlags.Instance Or Reflection.BindingFlags.NonPublic Or Reflection.BindingFlags.IgnoreCase)

        Dim monitor As Object = f.GetValue(o)

        Dim m As System.Reflection.MethodInfo = monitor.GetType.GetMethod("StopMonitoring", Reflection.BindingFlags.Instance Or Reflection.BindingFlags.NonPublic)

        m.Invoke(monitor, New Object() {})

    End Sub

CSharp (C#)

    private void FixAppDomainRestartWhenTouchingFiles()

{

       System.Reflection.PropertyInfo p = typeof(HttpRuntime).GetProperty("FileChangesMonitor", System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);

       object o = p.GetValue(null, null);

       System.Reflection.FieldInfo f = o.GetType().GetField("_dirMonSubdirs", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.IgnoreCase);

       object monitor = f.GetValue(o);

       System.Reflection.MethodInfo m = monitor.GetType().GetMethod("StopMonitoring", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);

       m.Invoke(monitor, new object[]);

}

Again I won't try to steal the credits.
Here is the link from where I got this solution.
http://dotnetslackers.com/Community/blogs/haissam/archive/2008/11/12/disable-session-expiration-when-using-directory-delete.aspx