The maximum request size, in bytes.
POST request can't be stoped. Connection can be hard terminated (See MaxRequestLengthToCloseConnection parameter); otherwise whole request will be received. If request greater than MaxRequestLength value PowUpload willn't save files but will get non-files Form fields; PowUpload.UploadStatus will be UploadState.Rejected in this case.
Settings.SettingsParams Class | ElementIT.PowUpload Namespace