Removing all whitespace lines from a multi-line string efficiently

Question

In C# what\'s the best way to remove blank lines i.e., lines that contain only whitespace from a string? I\'m happy to use a Regex if that\'s the best solution.

EDIT

Answer 1

string corrected = 
    System.Text.RegularExpressions.Regex.Replace(input, @"\n+", "\n");