UInt64.MaxValue Field

Represents the largest possible value of UInt64. This field is constant.

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

public const ulong MaxValue

The value of this constant is 18,446,744,073,709,551,615; that is, hexadecimal 0xFFFFFFFFFFFFFFFF.

The following example uses the MinValue and MaxValue fields to verify that a Double value is within the range of the UInt64 type before it performs a type conversion. This prevents an OverflowException at run time.

double decimalValue = -1.5;
ulong integerValue;

// Discard fractional portion of Double value
double decimalInteger = Math.Floor(decimalValue);

if (decimalInteger < ulong.MaxValue &&
    decimalInteger > ulong.MinValue)
   integerValue = (ulong)decimalValue;
   outputBlock.Text += String.Format("Converted {0} to {1}.", decimalValue, integerValue) + "\n";
   ulong rangeLimit;
   string relationship;

   if (decimalInteger > ulong.MaxValue)
      rangeLimit = ulong.MaxValue;
      relationship = "greater";
      rangeLimit = ulong.MinValue;
      relationship = "less";

   outputBlock.Text += String.Format("Conversion failure: {0} is {1} than {2}.",
                     rangeLimit) + "\n";


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.