StringBuilder builder1 = new StringBuilder( "Happy Birthday Jane" );
StringBuilder builder2 = new StringBuilder( "good bye greg" );
string output = "Before replacements:\n" + builder1.ToString() + "\n" + builder2.ToString();
builder1.Replace( "Jane", "Greg" );
builder2.Replace( 'g', 'G', 0, 5 );
output += "\n\nAfter replacements:\n" +
builder1.ToString() + "\n" + builder2.ToString();
Console.WriteLine( output);