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Stopwatch.StartNew Method

Initializes a new Stopwatch instance, sets the elapsed time property to zero, and starts measuring elapsed time.

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

public static Stopwatch StartNew()

Return Value

Type: System.Diagnostics.Stopwatch
A Stopwatch that has just begun measuring elapsed time.

This method is equivalent to calling the Stopwatch constructor and then calling Start on the new instance.

The following example uses the Stopwatch class to measure the performance of four different implementations for parsing an integer from a string. This code example is part of a larger example provided for the Stopwatch class.

long ticksThisTime = 0;
int inputNum;
Stopwatch timePerParse;

switch (operation)
{
    case 0:
        // Parse a valid integer using 
        // a try-catch statement. 

        // Start a new stopwatch timer.
        timePerParse = Stopwatch.StartNew();

        try 
        {
            inputNum = Int32.Parse("0");
        }
        catch (FormatException)
        {
            inputNum = 0;
        }

        // Stop the timer, and save the 
        // elapsed ticks for the operation.

        timePerParse.Stop();
        ticksThisTime = timePerParse.ElapsedTicks;
        break;
    case 1:
        // Parse a valid integer using 
        // the TryParse statement. 

        // Start a new stopwatch timer.
        timePerParse = Stopwatch.StartNew();

        if (!Int32.TryParse("0", out inputNum))
        { 
            inputNum = 0;
        }

        // Stop the timer, and save the 
        // elapsed ticks for the operation.
        timePerParse.Stop();
        ticksThisTime = timePerParse.ElapsedTicks;
        break;
    case 2:
        // Parse an invalid value using 
        // a try-catch statement. 

        // Start a new stopwatch timer.
        timePerParse = Stopwatch.StartNew();

        try 
        {
            inputNum = Int32.Parse("a");
        }
        catch (FormatException)
        {
            inputNum = 0;
        }

        // Stop the timer, and save the 
        // elapsed ticks for the operation.
        timePerParse.Stop();
        ticksThisTime = timePerParse.ElapsedTicks;
        break;
    case 3:
        // Parse an invalid value using 
        // the TryParse statement. 

        // Start a new stopwatch timer.
        timePerParse = Stopwatch.StartNew();

        if (!Int32.TryParse("a", out inputNum))
        { 
            inputNum = 0;
        }

        // Stop the timer, and save the 
        // elapsed ticks for the operation.
        timePerParse.Stop();
        ticksThisTime = timePerParse.ElapsedTicks;
        break;

    default:
        break;
}

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

.NET Compact Framework

Supported in: 3.5

XNA Framework

Supported in: 3.0, 2.0, 1.0

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