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A RemotingSurrogateSelector selects surrogates - or class that serialize other classes that aren't serializable themselves. So, if some class isn't marked with the SerializationAttribute (and hence, not serializable regardless of whether or not is extends MarshalByRefObject), then you add an ISerializationSurrogate implementation associated with a Type you want to serialize.
What you're doing right now - though it may work - is very inefficient. As I mentioned before, you should just implement ISerializable (forget what MSDN says in this case - Microsoft does it throughout the FCL and I use it throughout a very large N-tier application I architected at work that uses .NET Remoting and a heck of a lot of sinks) and not serialize what you don't need to pass to the other application domain.
Microsoft MVP, Visual C#
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I see what you mean about inefficiency, and as implementing ISerializable requires about the same amount of coding, I am now doing it that way. Thanks again for your help.
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According to msdn and all .NET 1.1 docs, the ToolBar.BackColor property is intended to be public. Every attempt to access it in code, however, indicates that it was accidentally implemented as private. I have tried deriving new subclass from ToolBar to override the property and have tried casting up the chain to Control.BackColor. Neither route has worked. Any ideas on how to change the color of a ToolBar?
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It's not provide, but it is hidden from the code editor and property grid using the BrowsableAttribute and the EditorBrowsableAttribute. Why? Because it does nothing. This is actually common throughout the System.Windows.Forms members. You cannot explicitly set the background color of a ToolBar because the Toolbar common control that the ToolBar class encapsulates does not support background colors. It uses the Control color defined in your display settings. The same goes for a background image.
Microsoft MVP, Visual C#
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Hello,
I am trying to figure out a solution for hosting an application in IE, but runs on the client machine (to access printer configuration). I want to use C#, b/c the client has the .NET runtime, otherwise the answer would be, develop an ActiveX control (ATL).
Does anyone know how to write a C# app (winform) that is hosted in Internet Explorer?
For example, the user browses to http://someserver/somepage.aspx , which then downloads the C# app, and is hosted in IE. The app then has control to access printers on the local machine and local network (the same way windows does)
Thanks. 
R.Bischoff
.NET, Kommst du mit?
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Thanks for your helpful information.
How would you access the PrintDialog control from the control you are hosting in IE ?
Thanks.
R.Bischoff
.NET, Kommst du mit?
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Same as you would using any other form. It's just a control. If you're trying to access the print dialog for IE, that's not so simple and involves dispatch interfaces and client-side scripting.
You must also have the right code access permissions, which are documented in the class documentation for the classes you want to use.
My article does discuss code access security a little, so you need to author your control with this in mind. You shouldn't just assume you'll have FullTrust permissions - that's poor design.
Microsoft MVP, Visual C#
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Hi, I'm making a game and for some reason can't figure out how to play two sound events at the same time. I have a background playing but while it is playing another event can't seem to play. I know winmm.dll will not do it but i thought quartz.dll will.
here is what i have tried
public QuartzTypeLib.FilgraphManagerClass mc;
public QuartzTypeLib.FilgraphManagerClass froghop;
mc = new QuartzTypeLib.FilgraphManagerClass();
froghop = new QuartzTypeLib.FilgraphManagerClass();
QuartzTypeLib.FilgraphManager graphManager =
new QuartzTypeLib.FilgraphManager();
mc =(QuartzTypeLib.FilgraphManagerClass)graphManager;
froghop =(QuartzTypeLib.FilgraphManagerClass)graphManager;
i then make a thread that has this
mc.RenderFile("whateverbackground.mp3");
mc.Run();
that works fine
but i also have a keydown event that i want to play the froghop
so i try inside the keydown
froghop.RenderFile("blah.mp3");
froghop.Run();
the problem is while the background is playing the froghop never runs. is there away around this? Cause i thought active X's quartz.dll did the trick but i guess not.
Win32newb
"Programming is like sex, make one mistake and you have to support it for a long time"
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First, why are you using MP3s? For long-playing sounds like background music or something, it's fine; but, you need something quick to play, which is why WAVs are pretty common. Just look at the sound events for Windows (although that goes back a long time when WAVs were about the only sound files that existed).
Second, the KeyDown event is fired in the same thread that the control was created in (the UI thread), so if you started your background in the same thread, this may be the cause.
Finally, why not use Managed DirectX 9 instead of inteorp'ing with the ActiveX DLLs? There's a lot better support for managed code and it's not simply interop assemblies - it was written from the ground-up for managed applications. You could use DirectSound for your background sound while playing other sounds asynchronously.
You should try it. Download the Summer 2003 update (it's the full package) from http://msdn.microsoft.com/directx[^].
Microsoft MVP, Visual C#
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Yes, the run method appears to be blocking. I did what you were talking about having one play in the background and the other play async but i was hoping to not have to use two different methods. I'm looking into DirectX now just downloaded the sdk.
What I was currently doing is making the quartzTypeLib play the background which is a mp3
and then i use the tonysound class that i made that uses winmm.dll and i play the wav files seperately. that works just fine. I just did't want to have to include extra code. I figured i could have one library like directx or whatever and then just make new objects of it and play then whenever i want.
Hopefully directx will let me do this.
-tony-
Win32newb
"Programming is like sex, make one mistake and you have to support it for a long time"
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Quartz is part of DirectX - namely DirectShow, IIRC.
You don't need to use separate libraries, just to play the sounds asynchronously.
Microsoft MVP, Visual C#
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Ok you keep saying asynch and i know what that is. I just confess i haven't a clue how to do it with quartz.dll I was using winmm.dll before with the async flags but from my understanding and based on what i have seen regardless if i have nowait and nostop flags thrown i still can't play another sound while the primary one is playing. That being with Winmm.dll Also, any idea to why directx sdk refuses to work with VS.net 2002? Do i have to ugrade to 2003 for it to work or something? I tried everything i know of i tried adding the references. i tried putting the dlls in the preassembly folder. nothing works. the wizard wants microsoft.directx.dll and when i add the refernce to the samples
then i get filenotfound exceptions.
Win32newb
"Programming is like sex, make one mistake and you have to support it for a long time"
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I never said anything about async flags - just multi-thread your app and run each sound in a separate thread.
Read my other reply. You didn't install the managed portion of the SDK, which you must do. Works just fine for me. 1) Install the SDK. 2) Install the Managed developer runtime (debug or retail). 3) Write your Managed DirectX application.
Microsoft MVP, Visual C#
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Ok trying this DirectX sound with a no go. I installed the sdk. I clicked on the sample file and opened it up. when i go to compile it can't find Microsoft.DirectX or anything in refernece to directX. So I did a search for the dll and added the reference to the project. Now it compiles but i get filenot found exception on the example 
Any idea do i need to uninstall directx and reinstall again?
Win32newb
"Programming is like sex, make one mistake and you have to support it for a long time"
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You need to install the Managed DirectX runtime. When you install the SDK, this is not installed. There is a sub-directory of your SDK directory (something like C:\DX90SDK\Developer Runtime\Managed DirectX\Debug) that contains the managed install. This installs the DirectX managed assemblies into the GAC (so they're found at runtime) and adds the install folder to the HKLM\Software\Microsoft\.NETFramework\AssemblyFolders registry key so that VS.NET can find them. Remember, assemblies used during design time don't necessary mean they'll be used at run-time. It's all about how assemblies are resolved.
Take, for example, all the FCL assemblies. While at run-time the assemblies in the GAC are used, at design-time VS.NET (or even the C# compiler, csc.exe with the default response file) use the assemblies in the %WINDIR%\Microsoft.NET\Framework.v<version> directory.
Microsoft MVP, Visual C#
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Well thanks for the help but DirectX doesn't want me to learn it evidently.
The samples DO not work. I constantly get the error I describe. I did exactly waht you said I installed the sdk. I then ran the msi to install the managed directx. i then go to vs.net and click on directx wizard and it crashs saying it needs microsoft.directx.dll.
I even try it without the wizard and run the samecode compile and then run, and i get the same exact error. Its obviously a problem cause I have seen it all over the net but i can't seem to find a solution. They basically say the same thing are you but its simply not working for me.
Win32newb
"Programming is like sex, make one mistake and you have to support it for a long time"
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If it's not finding the assembly, then go to the Managed DirectX runtime directory (usually in %WINDIR%\Microsoft.NET\Managed DirectX and run gacutil.exe /i on the assemblies you find in there. This will install them into the GAC so that they can be resolved by the CLR.
Microsoft MVP, Visual C#
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Hi Heath,
Here is the start of my webservice Update method. How does this look? Did I leave anything out? Can I use messagebox object inside a webservice? If this is running on the server it wouldn't be viewable to client correct?
<br />
<br />
public bool UpdateDB(dataset dsDiff)<br />
{<br />
string sSQL;<br />
<br />
sSQL = @"SELECT * From MidnightReadings";<br />
<br />
SqlConnection myCon = new SqlConnection("user id=username;" + <br />
"password=password;server=localhost;" + <br />
"Trusted_Connection=yes;" + <br />
"database=database; " + <br />
"connection timeout=30");<br />
<br />
UpdateDB = false;<br />
<br />
try<br />
{<br />
SqlDataAdapter da = new SqlDataAdapter(sSQL,myCon);<br />
SqlCommandBuilder cb = new SqlCommandBuilder(da);<br />
cb.GetInsertCommand();<br />
cb.GetUpdateCommand();<br />
da.Fill(dsDiff,"MidNight");<br />
da.Update(dsDiff);<br />
<br />
}<br />
catch(SqlException e)<br />
{<br />
string errorMessage = "Message: " + e.Message + "\n" +<br />
"Source: " + e.Source + "\n" +<br />
"State: " + e.State + "\n" +<br />
"Procedure: " + e.Procedure + "\n";<br />
<br />
System.Diagnostics.EventLog log = new System.Diagnostics.EventLog();<br />
log.Source = "Web Service: wsMNMhzData Encountered an Error";<br />
log.WriteEntry(errorMessage);<br />
Console.WriteLine("An exception occurred. Please contact your system administrator.");<br />
}<br />
<br />
<br />
<br />
<br />
return true;<br />
}<br />
<br />
Thanks,
JJ
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MrJJKoolJ wrote:
Can I use messagebox object inside a webservice?
You can't.
MrJJKoolJ wrote:
cb.GetInsertCommand();
cb.GetUpdateCommand();
These lines are not needed. They will set automaticlly.
MrJJKoolJ wrote:
Console.WriteLine("An exception occurred. Please contact your system administrator.");
If you want to inform user an error occured , you can thrown SoapException and report it in your client. That line won't work. Also you can return a error code instead od throwing exception
Mazy
"One who dives deep gets the pearls,the burning desire for realization brings the goal nearer." - Babuji
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Hi Mazy,
How do I return an Error code back to the client from web service?
Thanks,
JJ
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Just set return value as an integer , which you can define for yourself that each number refer to specific error. You can return it in your catch block and outside it return 0 , just like many of win32 API do. Other way as I mentioned throwing SoapException which could be caught in client. You can search for it in Google for sample. Hope it helps. 
Mazy
"One who dives deep gets the pearls,the burning desire for realization brings the goal nearer." - Babuji
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Hi Gurus,
i am using following code to send request to php page on button click function:
HttpWebRequest request = (HttpWebRequest) WebRequest.Create("http://www.umc.ua/misc/sendsms.php");
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
string postData = "network1="+oper.Text+"&Phone1="+phone.Text+"&Message="+text.Text+"&sender_name=sn";
byte[] buffer = Encoding.ASCII.GetBytes(postData);
request.ContentLength = buffer.Length;
Stream s = request.GetRequestStream();
s.Write(buffer, 0, buffer.Length);
s.Flush();
s.Close();
But when I lauching my program and clicking much times on to invoke this code an exception occurs:
"Unable to write data to the transport connection"
It happens aproximately every 10-15 times. Could someone tell what wrong with my code? Thanx
www.xedom.com
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First, you should encode the param values or they could be used to crack your CGI and beyond.
Second, are you actually getting the response from the server using request.GetResponse, or are you just queueing requests?
Finally, are the param values the same each time you click the button in your test case?
Microsoft MVP, Visual C#
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