DirectInputControllerExtensionbufferSize Property

Gets or sets the input buffer size. The buffer size determines the amount of data that the buffer can hold between calls to GetDeviceData before data is lost. You can set this value to 0 to indicate that the application does not read buffered data from the device. If the buffer size is too large for the device to support it, then the largest possible buffer size is set. However, this property always returns the buffer size set using the BufferSize property, even if the buffer cannot be supported because it is too large.

public int bufferSize { get; }