MemoryFailPoint Constructor

Note: This constructor is new in the .NET Framework version 2.0.

Initializes a new instance of the MemoryFailPoint class, specifying the amount of memory required for successful execution.

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

Public Sub New ( _
	sizeInMegabytes As Integer _
Dim sizeInMegabytes As Integer

Dim instance As New MemoryFailPoint(sizeInMegabytes)
public MemoryFailPoint (
	int sizeInMegabytes
public function MemoryFailPoint (
	sizeInMegabytes : int



The required memory size in megabytes.

Exception typeCondition


The specified memory size is negative.


There is insufficient memory to begin execution of the code protected by the gate.

The amount of memory used by your application to process a work item can be determined empirically. To estimate the amount of memory your application needs to process a request, consider using the GC.GetTotalMemory method to determine the amount of memory available before and after calling the method that processes the work item. See the MemoryFailPoint class for a code example that dynamically determines the value for the sizeInMegabytes parameter.

The following code example demonstrates how to determine the amount of memory a method requires when executing. This code example is part of a larger example provided for the MemoryFailPoint class.

private static int EstimateMemoryUsageInMB()
    int memUsageInMB = 0;

    long memBefore = GC.GetTotalMemory(true);
    int numGen0Collections = GC.CollectionCount(0);
    // Execute a test version of the method to estimate memory requirements.
    // This test method only exists to determine the memory requirements.
    // Includes garbage generated by the worker function.
    long memAfter = GC.GetTotalMemory(false);
    // If a garbage collection occurs during the measuring, you might need a greater memory requirement.
    Console.WriteLine("Did a GC occur while measuring?  {0}", numGen0Collections == GC.CollectionCount(0));
    // Set the field used as the parameter for the MemoryFailPoint constructor.
    long memUsage = (memAfter - memBefore);
    if (memUsage < 0)
        Console.WriteLine("GC's occurred while measuring memory usage.  Try measuring again.");
        memUsage = 1 << 20;

    // Round up to the nearest MB.
    memUsageInMB = (int)(1 + (memUsage >> 20));
    Console.WriteLine("Memory usage estimate: {0} bytes, rounded to {1} MB", memUsage, memUsageInMB);
    return memUsageInMB;

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0

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