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

I'll go with:

  public static string RemoveEmptyLines(string value) {
    using (StringReader reader = new StringReader(yourstring)) {
      StringBuilder builder = new StringBuilder();
      string line;
      while ((line = reader.ReadLine()) != null) {
        if (line.Trim().Length > 0)
          builder.AppendLine(line);
      }
      return builder.ToString();
    }
  }