ToInt64 Method (Byte)

Convert.ToInt64 Method (Byte)

Converts the value of the specified 8-bit unsigned integer to the equivalent 64-bit signed integer.

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

public static long ToInt64(
	byte value


Type: System.Byte
The 8-bit unsigned integer to convert.

Return Value

Type: System.Int64
A 64-bit signed integer that is equivalent to value.

The following example converts each element in an array of bytes to a long integer.

byte[] bytes = { Byte.MinValue, 14, 122, Byte.MaxValue};
long result;

foreach (byte byteValue in bytes)
   result = Convert.ToInt64(byteValue);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                     byteValue.GetType().Name, byteValue,
                     result.GetType().Name, result);
// The example displays the following output:
//       Converted the Byte value 0 to the Int64 value 0.
//       Converted the Byte value 14 to the Int64 value 14.
//       Converted the Byte value 122 to the Int64 value 122.
//       Converted the Byte value 255 to the Int64 value 255.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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