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Convert.ToInt64 Method (Int64)

Returns the specified 64-bit signed integer; no actual conversion is performed.

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

public static long ToInt64(
	long value


Type: System.Int64
A 64-bit signed integer.

Return Value

Type: System.Int64
value is returned unchanged.

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

int[] numbers = { Int32.MinValue, -1, 0, 121, 340, Int32.MaxValue };
long result;
foreach (int number in numbers)
   result = Convert.ToInt64(number);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                     number.GetType().Name, number,
                     result.GetType().Name, result);
// The example displays the following output:
//    Converted the Int32 value -2147483648 to the Int64 value -2147483648.
//    Converted the Int32 value -1 to the Int64 value -1.
//    Converted the Int32 value 0 to the Int64 value 0.
//    Converted the Int32 value 121 to the Int64 value 121.
//    Converted the Int32 value 340 to the Int64 value 340.
//    Converted the Int32 value 2147483647 to the Int64 value 2147483647.

.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.