Question

DirectoryInfo di = new DirectoryInfo(lPath); 
DirectoryInfo dest = new DirectoryInfo(lPath9);
if (!dest.Exists) dest.Create(di.GetAccessControl());
string mapDirName = di.FullName;
di.Delete(true);
Thread.Sleep(20);  // let the process wait a bit       
dest.MoveTo(mapDirName);           
Thread.Sleep(20);  // let the process wait a bit

The above code works most of the time. However, sometime some sub-directories are missing after dest is renamed to di.

I think it is because the rename has started before the delete is complete.
I can add a while loop to check for the existence of di before I rename.
Such as,

int i=0;
While (di.Exists && i < 10) {
     Thread.Sleep(10000);
     i++;
}

Still it would only wait 10000*10 milliseconds. There is no sure way of doing it without getting into an infinite loop.

Answer 1

Instead of waiting an arbitrary amount of time before moving the dest directory, why not loop through the files in the di directory?

foreach (FileInfo file in di.GetFiles())
{
    File.Delete( file );
}

dest.MoveTo( mapDirName );