UInt64.Parse Method (String, IFormatProvider)

Converts the string representation of a number in a specified culture-specific format to its 64-bit unsigned integer equivalent.

This method is not CLS-compliant.   The CLS-compliant alternative is Parse(String).

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

public static ulong Parse (
	string s,
	IFormatProvider provider
/** @attribute CLSCompliantAttribute(false) */ 
public static UInt64 Parse (
	String s, 
	IFormatProvider provider
public static function Parse (
	s : String, 
	provider : IFormatProvider
) : ulong
Not applicable.



A string representing the number to convert.


An IFormatProvider that supplies culture-specific formatting information about s.

Return Value

A 64-bit unsigned integer equivalent to the number specified in s.

Exception typeCondition


The s parameter is a null reference (Nothing in Visual Basic).


The s parameter is not in the correct style.


The s parameter represents a number less than MinValue or greater than MaxValue.

This overload of the Parse(String,IFormatProvider) method is typically used to convert text that can be formatted in a variety of ways to a UInt64 value. For example, it can be used to convert the text entered by a user into an HTML text box to a numeric value.

The s parameter contains a number of the form:


Items in square brackets ('[' and ']') are optional, and other items are as follows.


Optional white space.


An optional positive sign.


A sequence of digits ranging from 0 to 9.

The provider parameter is an IFormatProvider that obtains a NumberFormatInfo. The NumberFormatInfo provides culture-specific information about the format of s. If provider is a null reference (Nothing in Visual Basic), the NumberFormatInfo for the current culture is used.

The following example is the button click event handler of a Web form. It uses the array returned by the HttpRequest.UserLanguages property to determine the user's locale. It then instantiates a CultureInfo object that corresponds to that locale. The NumberFormatInfo object that belongs to that CultureInfo object is then passed to the Parse(String,IFormatProvider) method to convert the user's input to a UInt64 value.

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0