StringBuilder.Length
using System; using System.Text; class StringBuilderFeatures { static void Main(string[] args) { StringBuilder buffer =new StringBuilder( "Hello, how are you?" ); string output = "buffer = " + buffer.ToString() + "\nLength = " + buffer.Length + "\nCapacity = " + buffer.Capacity; buffer.EnsureCapacity( 75 ); output += "\n\nNew capacity = " +buffer.Capacity; // truncate StringBuilder by setting Length property buffer.Length = 10; output += "\n\nNew length = " + buffer.Length + "\nbuffer = "; // use StringBuilder indexer for ( int i = 0; i < buffer.Length; i++ ) output += buffer[ i ]; Console.WriteLine( output); } }