Open a file and replace strings in C#

Question

I\'m trying to figure out the best way to open an existing file and replace all strings that match a declared string with a new string, save it then close.

Suggestio

Answer 1

Slight improvement on the accepted answer that doesn't require Regex, and which meets the requirements of the question:

File.WriteAllText("Path", File.ReadAllText("Path").Replace("SearchString", "Replacement"));