BasicHttpBinding.MaxBufferSize Property

Gets or sets the maximum size, in bytes, for a buffer that receives messages from the channel.

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

public int MaxBufferSize { get; set; }

Property Value

Type: System.Int32
The maximum size, in bytes, of a buffer that stores messages while they are processed for an endpoint configured with this binding. The default value is 65,536 bytes.

If there is not sufficient memory in the buffer to store the message while it is processed, more memory must be allocated from the CLR heap, which increases the garbage collection overhead. Extensive allocation from the CLR garbage heap is an indication that the message buffer size is too small and that performance can be improved with a larger allocation.

The value of the MaxBufferSize property and its significance is different depending on whether the messages are being buffered or streamed on the channel through which they are being received:

The limitations on buffer size set here are for optimizing the performance of message exchanges. If a message exceeds the maximum value set for the buffer, it is not dropped. Instead, more memory is requested from the CLR heap and this incurs more garbage collection overhead than using the buffers.


The settings for MaxBufferSize and MaxReceivedMessageSize, are local behavioral settings. This means that they are not transmitted to other endpoints in metadata. If you generate a proxy to a service with a maximum message size of 2GB from metadata, the proxy still has a default value of 64K. This leaves control of the appropriate bounds for message and message buffer size in the scope of local administrators.

The following example sets MaxBufferProperty to 1,000,000 bytes.

		    BasicHttpBinding binding = new BasicHttpBinding();
		    // set to one million
		    binding.MaxBufferSize = 1000000;

The value of this property can also be set in the configuration file.

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library