Create a StringBuilder which hold 100 characters.

   
 
 
using System;
using System.Text;

class StringApp {
    static void Main(string[] args) {
        StringBuilder myBuffer = new StringBuilder("My string data");
        Console.WriteLine(myBuffer.Capacity);
        myBuffer.Append(" contains some numerical data: ");
        myBuffer.AppendFormat("{0}, {1}.", 44, 99);
        Console.WriteLine(myBuffer.Capacity);
        Console.WriteLine(myBuffer);

    }
}