ToString Method (String)
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UInt64.ToString Method (String)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Converts the numeric value of this instance to its equivalent string representation using the specified format.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public string ToString(
	string format


Type: System.String
A numeric format string.

Return Value

Type: System.String
The string representation of the value of this instance as specified by format.


The format parameter is invalid.

The format parameter can be any valid standard numeric format specifier, or any combination of custom numeric format specifiers. If format is equal to String.Empty or is null, the return value of the current UInt64 object is formatted with the general format specifier ("G"). If format is any other value, the method throws a FormatException.

The format of the returned string is determined by the NumberFormatInfo object for the current culture. Depending on the format parameter, this object controls symbols such as the group separator and the decimal point symbol in the output string. To provide formatting information for cultures other than the current culture, call the ToString(String, IFormatProvider) overload.

The following example displays a 64-bit unsigned integer value by using each standard format string and some custom format strings.

using System;
using System.Globalization;

public class Example
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
      ulong value = 217960834;
      string[] specifiers = { "G", "C", "D3", "E2", "e3", "F", 
                              "N", "P", "X", "000000.0", "#.0", 
                              "00000000;(0);**Zero**" };

      foreach (string specifier in specifiers)
         outputBlock.Text += String.Format("{0}: {1}", specifier, value.ToString(specifier)) + "\n";
// The example displays the following output:
//       G: 217960834
//       C: $217,960,834.00
//       D3: 217960834
//       E2: 2.18E+008
//       e3: 2.180e+008
//       F: 217960834.00
//       N: 217,960,834.00
//       P: 21,796,083,400.00 %
//       X: CFDD182
//       000000.0: 217960834.0
//       #.0: 217960834.0
//       00000000;(0);**Zero**: 217960834

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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