I'm writing a program (Vis. C# .NET) to move files, depending from content, to a backup server. Sometimes the file cannot be deleted afdter copying because it is opened by an other process. The best would be to have a test a first that gives me a result if a specific file is opened by an other process or not. How this can be done ? At least I need a boolean answer if the file is opened in this moment by anything other or not. The better way would be to have an answer which process has opened it. Can anybody give me a hint for a good solution ? Holger