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NamedPipeServerStream.BeginWaitForConnection Method

Begins an asynchronous operation to wait for a client to connect.

Namespace:  System.IO.Pipes
Assembly:  System.Core (in System.Core.dll)

[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public IAsyncResult BeginWaitForConnection(
	AsyncCallback callback,
	Object state


Type: System.AsyncCallback
The method to call when a client connects to the NamedPipeServerStream object.
Type: System.Object
A user-provided object that distinguishes this particular asynchronous request from other requests.

Return Value

Type: System.IAsyncResult
An object that references the asynchronous request.


The pipe was not opened asynchronously.


A pipe connection has already been established.


The pipe handle has not been set.


The pipe connection has been broken.


The pipe is closed.

This is the asynchronous equivalent of WaitForConnection.

EndWaitForConnection must be called exactly once for every call to BeginWaitForConnection.


The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, 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.