Any difference between File.ReadAllText() and using a StreamReader to read file contents?

Question

At first I used a StreamReader to read text from a file:

StreamReader reader = new StreamReader(dialog.OpenFile());
txtEditor.Text = reader.Read         


        

Answer 1

If you use File.ReadAllText to read an unmanaged logging file (control by fstream), call File.ReadAllText, there will have IO.Exception:

The file is control by another process

You must to use StreamReader ReadToEnd to replace it.