ToUInt64 Method

[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]

Converts the specified string representation of a number to an equivalent 64-bit unsigned integer.

This API is not CLS-compliant. 

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

public static ulong ToUInt64(
	string value


Type: System..::..String
A string that contains the number to convert.

Return Value

Type: System..::..UInt64
A 64-bit signed integer that is equivalent to the number in value, or 0 (zero) if value is nullNothingnullptrunita null reference (Nothing in Visual Basic).


value does not consist of an optional sign followed by a sequence of digits (0 through 9).


value represents a number that is less than UInt64..::..MinValue or greater than UInt64..::..MaxValue.

Using the ToInt64(String) method is equivalent to passing value to the Int64..::..Parse(String) method. value is interpreted by using the formatting conventions of the current thread culture.

If you prefer not to handle an exception if the conversion fails, you can call the UInt64.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.