How to move Files and diaplay the files which cannot be moved

1. Use a collection, best use a generic collection like List<String> or List<FileInfo>.^*1
2. Use an array or an arraylist. (Not recommended).
3. Store the paths to these files in a textfile.
4. Store the paths in a RDMBS or a NoSQL DB.

// Before the loop processing the files
List<String> notMovedFiles = new List<String>();


// This is inside the loop processing the files
if(fileNotMoved)
{
    notMovedFiles.Add(theFilePath); 
}