Convert.ToBoolean Method (UInt64)


The .NET API Reference documentation has a new home. Visit the .NET API Browser on to see the new experience.

Converts the value of the specified 64-bit unsigned integer to an equivalent Boolean value.

This API is not CLS-compliant.

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

public static bool ToBoolean(
	ulong value


Type: System.UInt64

The 64-bit unsigned integer to convert.

Return Value

Type: System.Boolean

true if value is not zero; otherwise, false.

The following example converts an array of UInt64 values to Boolean values.

ulong[] numbers = { UInt64.MinValue, 6121, 403890774, UInt64.MaxValue };
bool result;

foreach (ulong number in numbers)
   result = Convert.ToBoolean(number);                                 
   Console.WriteLine("{0,-26:N0}  -->  {1}", number, result);
// The example displays the following output:
//       0                           -->  False
//       6,121                       -->  True
//       403,890,774                 -->  True
//       18,446,744,073,709,551,615  -->  True

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Return to top