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Thread Constructor (ThreadStart, Int32)

Initializes a new instance of the Thread class, specifying the maximum stack size for the thread.

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

public Thread(
	ThreadStart start,
	int maxStackSize


Type: System.Threading.ThreadStart
A ThreadStart delegate that represents the methods to be invoked when this thread begins executing.
Type: System.Int32
The maximum stack size to be used by the thread, or 0 to use the default maximum stack size specified in the header for the executable.
Important   For partially trusted code, maxStackSize is ignored if it is greater than the default stack size. No exception is thrown.


start is null.


maxStackSize is less than zero.

Avoid using this constructor overload. The default stack size used by the Thread(ThreadStart) constructor overload is the recommended stack size for threads. If a thread has memory problems, the most likely cause is programming error, such as infinite recursion.

Important noteImportant

Beginning with the .NET Framework version 4, only fully trusted code can set maxStackSize to a value that is greater than the default stack size (1 megabyte). If a larger value is specified for maxStackSize when code is running with partial trust, maxStackSize is ignored and the default stack size is used. No exception is thrown. Code at any trust level can set maxStackSize to a value that is less than the default stack size.


If you are developing a fully trusted library that will be used by partially trusted code, and you need to start a thread that requires a large stack, you must assert full trust before creating the thread, or the default stack size will be used. Do not do this unless you fully control the code that runs on the thread.

If maxStackSize is less than the minimum stack size, the minimum stack size is used. If maxStackSize is not a multiple of the page size, it is rounded to the next larger multiple of the page size. For example, if you are using the .NET Framework version 2.0 on Microsoft Windows Vista, 256KB (262144 bytes) is the minimum stack size, and the page size is 64KB (65536 bytes).


On versions of Microsoft Windows prior to Windows XP and Windows Server 2003, maxStackSize is ignored, and the stack size specified in the executable header is used.

If you specify a very small stack size, you might need to disable stack-overflow probing. When the stack is severely constrained, the probing can itself cause a stack overflow. To disable stack overflow probing, add the following to your application configuration file.

    <disableStackOverflowProbing enabled="true"/>

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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.