What happens to an open Filestream if it is not close due to program crash?

Question

What will happen to an open FileStream if it is not close due to a program crash? Will it be close automatically? I can't enclose it in a try catch or using because I am doing something with the file. It's like I open the file with an Open button.

private void button1_Click(object sender, RoutedEventArgs e)
{
    fs = new FileStream("Test.txt", FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.Read);          
}

Then I do something with it. Then in the Exit or closing of the application I execute close.

fs.Close();

But what if something happens in between, like a program crash. Will the file be not accessible since it is not close properly? Thanks.

Answer 1

Actually we cannot know what will happen in such a situation. MSDN says about the FileStream Class that

If a process terminates with part of a file locked or closes a file that has outstanding locks, the behavior is undefined.