In my Application ,When I am hosted my application , that gives an error....

"
Exception: System.Security.SecurityException:That

assembly does not allow partially trusted callers.

Description: Application attemped to perform an

operation not allowed by the security policy.

To grant this application the required permission,

please contact your system administrator or change the

application trust level in the configuration file   "

I called the Hosting Company and they confirm that

the application runs on a Full Trust but their system

supports application with Medium Trust.

Ok , So I make my changes in Web.Config as

 <trust level="Medium" originUrl=""/>

I am also making a reference to an assembly from where this error is coming and added one line in it's assembly info class as

 <Assembly: AllowPartiallyTrustedCallers()>  

But still the error is same .

To test the application I set  

 <trust level="Medium" originUrl=""/>    in my machine level config file.

What else should I do.

This is very urgent.

Any kind of help is appreciated.
 

This subject is covered in the book:

Professional ASP.NET 2.0 Security, Membership, and Role Management
by Stefan Schackow 

HTH

/Kadji

Two more thing to add..

First ,I am using asp.net 2.0 and secondly, my assembly is referencing  another assembly ( named:  MySql.Data.dll ) which is a third party assembly.

 
Second , What is the link  of strong name with this error.

Should my assembly be strong named. 

Something isn't making sense here. You were originally running it as a full trust application and got the error? Then you talked to the hosting company, changed the trust level to medium, and still got the error. Is this all correct?

If so, it suggests that there is something else going on. Is the assembly being called directly from the code in a page, or indirectly through another assembly?

Anyway, on the surface it sounds like you've done the right things. We just have to figure out what is going on. 

Don

 No donkiely,

Let me explain again.

I have my application running on full trust. OK

After that I went to hosting company where they provide only medium trust.

So I have to  make my site to run in medium trust by changing in web.config file.

But there That error came. 

Okay, I think I finally understand.

But to make sure: The application is running under medium trust on the hosting server.  Your Web app calls an assembly, which in turn calls MySql.Data.dll. Do I have this right?

If I have this right, the problem is arising because MySql.Data.dll doesn't have the AllowPartiallyTrustedCallersAttribute (APTCA) set. This is what is happening, in a nutshell: Your partially trusted Web app is calling your custom assembly, which has APTCA set. That custom assembly is also running under partial trust, and is trying to call MySql.Data. But because MySql.Data doesn't have APTCA, you get the exception.

Make sense?

One solution is to create another assembly that wraps MySql.Data. IOW, its only purpose is to pass calls to MySql.Data. That assembly has to run with full trust, and must include APTCA. Then, because it runs with full trust, it can call MySql.Data.

Whether or not you can make this work depends on whether you can get your hosting company to let you run your custom assembly with full trust. Or you could try to convince the MySql people to decorate their assembly with APTCA. That may or may not be possible.

Don 

 Okay Mr. donkiely,

that means that hosting company should should run that custom assembly(sql.data.dll) with full trust. (What if they don't agree ).

I think I should explain my problem in detail.

Okay here I go,

I have My assembly called Query.dll( Which have queries written in it) which in turn calls another assembly called QueryBase.dll (Which defines which database has to call and set up the connection and connection string ,  becoz my application can use oracle or SQL or Acess or MySql ) which in turn calls this third party assembly called Sql.Data.dll.

One Stupid question(plz don't mind ) : - Should I have to make my these two assemblies strong to run on medium trust. ( about third assembly i don't know).

Becoz my assemblies are not strong.

I have tried APTCA  in my these two assemblies ( Query.dll & QueryBase.dll) but it didn't work ( may be my assemblies are  not strong ).

Bottom line is ....

My application works perfectly under Full trust.

But My hosting company does not allow full trust ( only supports Medium trust.)

When I make my aplpication to run on medium trust I have Error. 

By for now....

Now plz tell me what should  do.

Hmm. Off the top of my head I don't know if you have any options. I need to play around with the MySQL connector to see what options there may be, but I'm not optimistic. Let me do that and I'll let you know what I find.

In the meantime, if anyone else knows or sees what I'm missing, chime in!

Don 

Should my assemblies be strong named , to run in medium trust, in my case for my two assemblies. 

rajkumarsharma:

Should my assemblies be strong named , to run in medium trust, in my case for my two assemblies. 

That is not a requirement of running with non-Full trust. But a strong name can be necessary to match the assembly with a membership condition of a code group that assigns it a particular permission set. It's one of many options.

But if you're asking if this is the problem, no it isn't.

Don