Develop Reference

Preventing Exception thrown: 'System.Net.Sockets.SocketException' in System.dll

This one has been causing me some bother for a while. I have a TcpClient that runs on a thread and trys to connect to the client
client = new TcpClient();
client.Connect(m_Hostname, m_PortNum);
On failure the Connect function throws a SocketException if it cannot connect. Then after say, 10 seconds, it attempts to reconnect. The target client is basically has a listener socket that is only active periodically so it will attempt to reconnect to the target client throughout the lifetime of the program.
The problem is that the message Exception thrown: 'System.Net.Sockets.SocketException' in System.dll is spat out to the debugger every 10 seconds, each time it cannot connect. It seems there is no real way to prevent this from happening. I thought I could potentially check if the target machine is available first before connecting but I cant see this anywhere.
It seems bad to control program flow using exceptions but I am not sure of another way; worst case I'd like to prevent the exception from printing out in the debugger because it causes unnecessary spam.

BizTalk Error in event log on running request in SOAPUI

This is the error encountered in Event log of BizTalk Admin
xlang/s engine event log entry: Uncaught exception (see the 'inner
exception' below) has suspended an instance of service
'orchestration.AsyncOrchestration(ebb0442e-bff4-cd1c-f5dc-aff7c5086e57)'.
The service instance will remain suspended until administratively
resumed or terminated. If resumed the instance will continue from its
last persisted state and may re-throw the same unexpected exception.
InstanceId: 50fc5f8b-c9b9-44e1-9781-2a1391c145ec Shape name:
Expression_1 ShapeId: ddfccde4-3444-47c4-977d-228e66ffaae6 Exception
thrown from: segment 1, progress 17 Inner exception: Resolution of the
dependency failed, type =
"BizTalkComponents.Interface.ISsoSettingsReader", name = "(none)".
Exception occurred while: while resolving. Exception is:
InvalidOperationException - The current type,
BizTalkComponents.Interface.ISsoSettingsReader, is an interface and
cannot be constructed.
Are you missing a type mapping?

First, this has noting to do with SOAPUI or any specific client.
It seems that your deployment process has failed to include the SSO lookup components that are called in the failing Orchestration.
So, whichever set of component the app is using must be installed on the server.

Will fatal exceptions still allow a catch/finally to execute

Im wondering if when a fatal exception occurs in a try block which I cannot handle (OutOfMemory for example) will it still be able to send a notification in catch/finally block to tell me that the console application has stopped?
if not, what would be the proper way to send a notification in case of a fatal error?

OpenNetCf SDF not returning all adapters

When calling GetAllNetworkInterfaces() via:
INetworkInterface[] rgni = WirelessZeroConfigNetworkInterface.GetAllNetworkInterfaces();
I'm only getting back a single adapter back, RNDISFN1, which has a link-local address (169.254....).
I suspect something bad is happening to cause all of the adapters to not be populated in the array; under the debugger, when I fire off the function, I'm seeing:
A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll
A first chance exception of type 'System.ComponentModel.Win32Exception' occurred in CSharpSample.exe
A first chance exception of type 'System.MissingMethodException' occurred in OpenNETCF.Net.dll
A first chance exception of type 'OpenNETCF.Net.NetworkInformation.NetworkInformationException' occurred in OpenNETCF.Net.dll
To be clear, the end goal of this is to get a list of Wireless Profiles, and have the ability to switch between them.
For now, has anybody seen instances where GetAllNetworkInterfaces() doesn't return all of the adapters? I am using version OpenNetCF SDF v2.3 under Windows Mobile 6.

The fact you see a single adapter (and I can tell by the name) indicates that you're cradled. ActiveSync, in all its glory, shuts down all other radios when cradled and therefore no other radios will show up. Run the code when not cradled and you'll likely see your WiFi (and any other) adapters appear.

What causes the System.Web.HttpException with error code 0x80070057 on Page.Flush while debugging in VS2005?

Here is the complete error message:
An exception of type
'System.Web.HttpException' occurred in
System.Web.dll but was not handled in
user code
Additional information: The remote
host closed the connection. The error
code is 0x80070057.
and the offending code:
char[] buffer = oPage.HTML.HTML.ToCharArray();
Page.Response.Write(buffer, 0, buffer.Length);
Page.Response.Flush();
Page.Response.End();
The oPage.HTML.HTML is a string in a custom page object used by our app. The exception triggers on Page.Flush() and appears to be benign -- I just hit "continue" and everything goes along fine. This never appears at run time.
I have chased many, many Google hits down many rabbit holes and have found nothing. Visual Studio 2005, Vista Ultimate (IIS7).

I've been dealing with this same error for a while now, and my understanding is that when Flush is called, there must be a connection on the other end, otherwise, this error is thrown. It's easy to get into a "fire-and-forget" kind of model when writing web pages, but when the client disconnects (in this debugging case, you're the client), there's nowhere to flush to.
There are two solutions I've found to this:
Wrap Response.Flush and catch the exception.
Check Response.IsClientConnected before you call flush.
I'm not 100% sure about the second one...I'm still in the process of checking that one out.
Good luck!