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How to use C# string Format

String Format method replaces the argument Object into a text equivalent System.String.

string string.format(string format,Object arg0)


  • String format: The formatted String
  • Object arg0: The object to be formatted.

The Format String Syntax is like {indexNumber:formatCharacter}


  • String: The formatted String


  • System.ArgumentNullException: The formatted String is null.
  • System.FormatException: The format item in format is invalid.

The number indicating an argument to format is less than zero, or greater than or equal to

The number of specified objects to format.


Currency :

String.Format("{0:c}", 10) will return $10.00

The currency symbol ($) displayed depends on the global locale settings.

Date :

String.Format("Today's date is {0:D}", DateTime.Now)

You will get Today’s date like 01 January 2005

Time :

String.Format("The current time is {0:T}", DateTime.Now)

You will get Current Time Like 10:10:12

using System;
using System.Windows.Forms;

namespace WindowsApplication1
    public partial class Form1 : Form
        public Form1()

        private void button1_Click(object sender, EventArgs e)
            double dNum = 0;
            dNum = 32.123456789;
            MessageBox.Show("Formated String " + string.Format("{0:n4}", dNum)); 

When you run this C# source code, you will get “Formatted String 32.1234”.

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