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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.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0