Intermittent "File in Use" Error

I have some code that I wrote to basically clear out the directory every time the program runs through this point. I didn't want to bother enumerating files. If this is a bad way to do this, please tell me.

My main question, however, is about 开发者_运维技巧how to deal with the following: one of the files in the folder appears to be in use when it is most certainly not. The program runs on a ButtonClick event, and it exploded the first four or five times, but it worked after I confirmed that nobody was using the file on the server. There is only one person besides myself that would have been using it, and he confirmed that there was nothing running on his side that would be touching the file. Any ideas for what would cause this error/how to avoid it/how to handle it?

I am also having trouble reproducing the error...

string directory = @"\\server\directory\folder\";
    DirectoryInfo di = new DirectoryInfo(directory);

    if (di.Exists)
        di.Delete(true);

    Directory.CreateDirectory(directory);

If you are using Windows XP, this may help : http://msdn.microsoft.com/en-us/library/dd997370.aspx#remove_open_handles

Just an extract from the top of this page : "If you are running Windows XP or earlier, a delete operation on a file or directory that follows an enumeration could fail if there is an open handle that remains on one of the enumerated directories or files."

You may also use a software like Unlocker to identify the process locking your file.

If the file is in use, then someone is most certainly using it. :)

If you can access the server the files reside on, you can use a tool such as Process Explorer to find out which process has opened the file.