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How to handle the user authentication in CAB? I know that there is authentication service included in CAB but i don't know how to use to match my requirement.
Suppose: There are two types of users called ("Normaluser" and "Adminuser") in my System. There are 5 different modules (M1, M2, M3, M4 and M5) in System. The adminuser is allowed to access every modules and the Normaluser is able to access only 3 modules (M1, M2 and M3).
The problem is that the Adminuser log in to the system so that all 5 modules are loaded. then, he/she log out the system without shutting down the application. Then, the Normaluser log in to the Sytem. At that time, he/she is able to access all the modules. If we stop and restart the application then it works. I think i might need to unload the module when one user log out from the system.
I'd like to know how to do that.
Thanks in advance.
Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)
If you want to thank me for my help, please vote my message by clicking one of numbers beside "Rate this message". Why vote? Plz Read it here. Thank you. 
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I was doing some experiments on this issue during these days. I realized that it's so hard to unload the loaded dll(s) from current domain. In order to unload the dll (assembly) from current domain, we have to shift this dll to another domain and unload the whole new domain.. loading dll to different domain(s) is okay as long as they dont have visual. But modules have a lot of visual things 
Loading modules on deamand:
http://staff.southworks.net/blogs/matiaswoloski/archive/2006/02/26/CABModulesOnDemand.aspx
About restarting application
http://www.codeplex.com/smartclient/Thread/View.aspx?ThreadId=4786
Logout generally:
http://www.codeplex.com/smartclient/Thread/View.aspx?ThreadId=10140
Tell us more about CAB Modules isolation requirements
http://blogs.msdn.com/eugeniop/archive/2006/09/21/764953.aspx
It seems like the limitation of winform. The login/logout things is very common in practical project and I think it is a must to have in every applications. (Why do we need to shut down the application to change the logged-in users? )
However, I'm thinking another strategy to achieve this goal.
I created one small project in the same way mentioned in the sample ("08 ObjectBuilder with CAB" from Hand-on Lab ).
I made some changes (which is in bold) as following in BuildUp method.
public override object BuildUp(IBuilderContext context, Type t, object existing, string id)<br />
{<br />
if (existing == null)<br />
{<br />
return base.BuildUp(context, t, existing, id);<br />
}<br />
bool hideControl = false;<br />
Type targetType = existing.GetType();<br />
foreach (AuthorizationAttribute attr in<br />
targetType.GetCustomAttributes(typeof(AuthorizationAttribute), true))<br />
{<br />
string role = attr.Role;<br />
if (!Thread.CurrentPrincipal.IsInRole(role)) <br />
hideControl = true;<br />
<br />
}<br />
if (hideControl)<br />
{<br />
UserControl ctrl = existing as UserControl; <br />
<br />
if (ctrl != null)<br />
ctrl.Visible = false;
}<br />
<br />
foreach (PropertyInfo propertyInfo in targetType.GetProperties())<br />
{<br />
CheckAuthorization(context, existing, propertyInfo);<br />
}<br />
<br />
return base.BuildUp(context, t, existing, id);<br />
}
And put the [Authorization(Role = "manager")] in one of usercontrol of one module. The idea is that showing/hiding usercontrol based on User Level. If normal user log on to the System, the control that I mark should not be shown. But it doesn't work. If I set ctrl.Enabled = false; instead of ctrl.Visible = false; then it works. but it doesn't work with visible property.
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hi my friends
my english is weak, so i use simple sentences
I emergency need some code of vb.net
i want to find my harddisk serial number
i want to find my mainboard serial number
i want to find my cpu serial number
serial number or id , not difrent.
if u have
please insert them here
or send to me Golab_omidreza@yahoo.com
thanks
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thank you Michael![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif)
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I noticed that some xml files and pdb files are generated for dll file.
Suppose: I have one dll called "Microsoft.Practices.CompositeUI" in bin folder. Microsoft.Practices.CompositeUI.xml and Microsoft.Practices.CompositeUI.pdb are automatically generated when I build the application.
What are those file? What is the use of those files?
Thanks..
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The Microsoft.Practices.CompositeUI.xml file is the compiler generated XML documentation file. The contents of this file come from the XML comments in the source code.
The Microsoft.Practices.CompositeUI.pdb file is the debugging symbol file, also generated by the compiler. It contains the debugging "symbols" (information) needed by the debugger to be able to match the compiled binary to the source code when you are debugging.
-----------------------------
In just two days, tomorrow will be yesterday.
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Okay. I got it. Thanks a lot..
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I was sure that the old DataGrid had a built-in capability to move the current row based on user keystrokes.
Now I can't get it to do that, and tried the same with the newer DataGridView, but same problem.
I know I could set up a textbox, capture the word and do a search, but I thought there was functionality to do so if the focus was on the DataGrid or DataGridView itself.
Anyone?
________
42 is not the meaning of life. I knew that when I turned 43.
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Please remove one of these entries. You only need to ask the question once.
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I have made a desktop based SMS system in C# Dotnet 2.0 and integrate it with an old enterprise solution build in VB6.0.
On Runtime, the Vb6.0 exe is running from local machine and after loading it reads the system registry and extract a remote path to call all the other dll's from a remote location. The benefit is that all the executables is resides on a single remote location and you just have to distribute an exe to all the clients and set the value of remote path in their registry.
A simple 3 tier architecture Where you have a client which is a vb6.0 exe say client.exe and an application server which holds the middle tier or all the executables and a database server.
The location of the database server, password to connect, userid's and location of the application server is saved in Registry through a utility.
This means that all the exe's and dll's are loaded from a remote location which is a shared resource in a network.
Now my problem is that. When my sms exe say sms1000.exe written in c# dotnet 2.0 is called by this client.exe it gives this error in application log and not running.
Faulting application sms1000.exe, version 1.0.0.0, stamp 468dbd07, faulting module kernel32.dll, version 5.2.3790.3959, stamp 45d70ad8, debug? 0, fault address 0x0000bee7.
I must include here that all of my executables and dll's are strong name assemblies and sice it's loaded from a network location I've changed the intranet group to a Fulltrust through this command
CasPol.exe -chggroup 1.2 FullTrust
I've tested it on Windows 2000, Windows XP and Windows 2003 machines and it's running fine. However currently I'm deploying this application from a remote desktop to client located outside my country. On some of their machines running windows 2003 it's running fine However it's not running fine on a few of them which runs windows 2003 as well giving this error in System Application Log.
Faulting application sms1000.exe, version 1.0.0.0, stamp 468dbd07, faulting module kernel32.dll, version 5.2.3790.3959, stamp 45d70ad8, debug? 0, fault address 0x0000bee7.
Source of event says: .Net 2.0 Runtime error.
Any one has any resolution?
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Hi,
I'd like to know how I can find out which language
the operating system has from which my application is started.
For example, someone starts the application on a German Windows PC,
the app should be in german and if started on an English Windows PC,
it should be English.
I know how to use the Resource Files for this, but usally I'm doing this
by choosing the language manually and not automatically.
Thanks in advance
greetz pdluke
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Hi,
have a look at CultureInfo class
also Application.CurrentCulture and Thread.CurrentCulture
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Pls clarify
I created an assembly and deployed it automatically setted in windows\system directory.
while i restarting the machine .its showing error and dotnet cannot able to load. we can set the separate directory to the assembly with our code files
kankeyan
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You might want to provide a bit more information :P
Whats the assembly supposed to do, whats the extact error message, wtf do you mean by:
kankeyan wrote: we can set the separate directory to the assembly with our code files
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Hi,
I think that you need to create strong name for your assembly and install it to GAC. I belive that this will solve your porblem.
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Hi friends,
How i can make a pdf file using c# with out using any 3rd party products?
Please advice me..
Thanks
Nithin
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Learn the PDF file format. Write code that generates it. That's basically your only option, if something was built in, the third party products would not exist.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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ITextSharp -- Opensource PDF solution.
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I've been wrestling with the idea of defaulting member variables, not necessarily in the constructor, but in their accessor properties. For example:
private string _name;
public string Name
{
get
{
if (this._name == null) this._name = String.Empty;
return this._name;
}
set { this._name = value; }
}
This way, I know that, no matter what, whenever I access MyObject.Name, I'll be getting a valid string object and never a null, so that when I go to do MyObject.Name.Trim(), I'll never get a null object exception. This saves me time and lines of code in my application.
My question is, is this good practice? Is it better to let the exception occur and check for null elsewhere?
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I think generally you want to avoid get accessors that have a "side effect" like this. The better way would be to ensure that the variable is set to the appropriate default in the constructor (or when it is declared) and then restrict the allowable values in the set accessor.
For your example, it would look something like this:
private string _name;
public string Name
{
get
{
return this._name;
}
set
{
if (value == null)
{
throw new ArgumentNullException("value");
}
if (value == null)
{
value = String.Emtpy;
}
if (String.Compare(this._name, value, StringComparison.InvariantCultureIgnoreCase) != 0)
{
this._name = value;
}
}
}
The call to String.Compare isn't required but it prevents the backing variable from being changed unnecessarily.
-----------------------------
In just two days, tomorrow will be yesterday.
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So in this example, what is use of preventing assignment of the member object to null? I'd still have to be prepared for null values to come back from the Name property, so if I'm prepared for that in my code, why would I then prevent the ability to set it to null? Though it seems like your example now tells the user that there was an attempt to write to the member object at some point because it is no longer null, whereas in mine, you never know if anyone tried to set it.
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The example I provided assumes that _name has already been set to it's default value (presumably of String.Empty) in the constructor.
With the variable already having it's default value and restricting it from being set to null in the set accessor, you should never return a null value from the get accessor.
-----------------------------
In just two days, tomorrow will be yesterday.
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That makes sense, and I appreciate your taking the time to answer, Scott. 
This seems functionally equivalent to what I described, which is great, but I'm quite not certain what this method buys me. Predictability? What is your reasoning for doing this? I really want to understand.
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No problem. I'm glad I was able to clarify the example.
It is very similar functionaly to your original example. The benefit here is that you guarantee that accessing a property does not change the internal state of your object, generally termed a "side effect". In your example, the internal state could possibly change when the property is accessed.
In order to achieve your result of guaranteeing that the property is not null when it is accessed, the backing variable should be set to some appropriate default (in this case, String.Emtpy) as early as possible and then the property should prevent someone from explicitly setting it to null.
The choice is yours to decide how to restrict setting it to null and depends on your desired behavior. I have written properties using both methods and they both have their place, you just need to decide which is appropriate for your context.
A lot of properties (particularly in the CLR itself) raise property change events when the value of the property changes. These events are not "smart" so they are always raised. The call to the String.Compare method prevents the property from being set to the same value it currently holds, which prevents the property change events from being raised.
-----------------------------
In just two days, tomorrow will be yesterday.
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