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StringBuilder EnsureCapacity method

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);       }    }