C# 0 The Complete Reference

PART II

C h a p t e r   2 5 :  

N e t w o r k i n g   T h r o u g h   t h e   I n t e r n e t   U s i n g   S y s t e m . N e t    

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WebException

 has two properties that relate to network errors: 

Response

 and 

Status

.

You can obtain a reference to the 

WebResponse

 object inside an exception handler through 

the

Response

 property. For the HTTP protocol, this object describes the error. It is defined 

like this:

public WebResponse Response { get; }

When an error occurs, you can use the 

Status

 property of 

WebException

 to find out what 

went wrong. It is defined like this:

public WebExceptionStatus Status {get; }

WebExceptionStatus

 is an enumeration that contains the following values:

CacheEntr yNotFound

ConnectFailure

ConnectionClosed

KeepAliveFailure

MessageLengthLimitExceeded

NameResolutionFailure

Pending

PipelineFailure

ProtocolError

ProxyNameResolutionFailure

ReceiveFailure

RequestCanceled

RequestProhibitedByCachePolicy

RequestProhibitedByProxy

SecureChannelFailure

SendFailure

Ser verProtocolViolation

Success

Timeout

TrustFailure

UnknownError

Once the cause of the error has been determined, your program can take appropriate action.