Unable to Create Wrapper

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1.unable to create the offline cache location when trying to create a

The vs.net application is running on my local machine and im trying to
create the project on a remote server.  It gives me the above error
saying the volume lable or syntax is incorrect.  Which is
understandable because it can't create a folder with that name but why
can't i make it work.  HELP!  This is very frustrating.

2.unable to create the offline cache location when trying to create a new project

unable to create the offline cache location when trying to create a
new project.

The vs.net application is running on my local machine and im trying to
create the project on a remote server.  It gives me the above error
saying the volume lable or syntax is incorrect.  Which is
understandable because it can't create a folder with that name but why
can't i make it work.  HELP!  This is very frustrating.

3.Giving one managed wrapper class access to the unmanged part of another managed wrapper class

Here is the scenario I'm trying to make work.

I've got 2 managed C++ classes, each of which wrappes an unmanaged C++
class, kind of like so:

__nogc class UnmanagedClassA
{
   public:
      void SetUnmanagedB( UnmangedClassB* val );
...
};
__gc class ManagedClassA
{
   public:
     MangedClassA() :
       m_unmanagedA(__nogc new UnmanagedClassA() )
     { }

   private:
     __nogc UnmanagedClassA* m_unmanagedA;
};

__nogc class UnManagedClassB
{
...
};
__gc class ManagedClassB
{
   public:
     MangedClassB() :
       m_unmanagedB(__nogc new UnmanagedClassB() )
     { }

   private:
     __nogc UnmanagedClassB* m_unmanagedB;
};

The managed wrapper classes were created to allow using the unmanaged
classes in C#.

I need to be able to hand an instance of ManagedClassB to ManagedClassA
and have it pass the m_unmanagedB pointer to a method of m_unmanagedA.
Something like this:

void ManagedClassA::SetManagedB( ManagedClassB* b )
{
   m_unmanagedA->SetUnmanagedB( b->m_unmanagedB );
}

My first question is: what is the best way to accomplish this task
(idealy without making m_unmangedB public)? and my second question is
why doesn't my solution below work?

Below is my solution that doesn't quite work:

In traditional C++ I would simply declare ManagedClassA as a private
friend of ManagedClassB and everything would be good, but I have come
to the understanding that friends aren't allowed in managed C++ so I've
created a unmanged nested class to solve the problem, something like
this

__gc class ManagedClassB
{
   public:
     ManagedClassB() :
       m_unmanagedB(__nogc new UnmanagedClassB() )
     { }

   private:
     __nogc UnmanagedClassB* m_unmanagedB;

   public:
   __nogc class NestedFriendClass
   {
     public:
        NestedFriendClass( ManagedClassB* owner)
        {
           m_owner = gcroot<ManagedClassB*>(owner);
        }
        UnmanagedClassB* GetUnmanagedB()
        {
           return m_owner->m_unmanagedB;
        }
     private:
        gcroot<ManagedClassB*> m_owner;
   }
};

And the MangedClassA::SetManagedB() method becomes something like.

void ManagedClassA::SetManagedB( ManagedClassB* b )
{
   ManagedClassB::NestedFriendClass temp( b );
   m_unmanagedA->SetUnmanagedB( temp.GetUnmanagedB() );
}

Now this all compiles fine but when I run it I get a
'System.FieldAccessException' exception in
ManagedClassB::NestedFriendClass::GetUnmanagedB().

Now this implies to me that the public, protected, and private access
specifiers are being enforced at run time for unmanaged code which is
surprising to me, can anyone tell me what's going on here.

I will admit that I'm relatively new to the managed C++ and C# worlds
so I may be missing something simple here. I do consider myself a very
advanced traditional C++ programmer.
Also I'm currently using MS Visual Studio 2003.NET and we are upgrading
to 2005.NET next week.

4.creating data provider (IBindingList, DataTable wrapper) for DataGrid?

hello.

i'm trying to implement IBindingList to wrap DataTable
(like DataView) with hierarchy capabilities
and bind it to DataGrid.
The problem is i don't know
yet all the stuff i need to know.
the current problem - what should i return in the
IList[int index] indexer?
definetely not DataRow object.

could i find somewhere tutors, samples?

alex.

5.Problem creating wrapper

Hi
I have been asked by our web host to build a wrapper for a third party
component we wish to use on our web application.
The reason behind this was so I could add the two following lines:
[assembly: AssemblyKeyFileAttribute(@"..\..\keyPair.snk")]
[assembly: AllowPartiallyTrustedCallersAttribute()]
and they will then store my wrapper in the GAC and my Application will
access the component using my trusted wrapper.


I have never built a wrapper before and I am getting the following
error when I attempt to view the page with my component/wrapper on it:

Exception Details: System.NullReferenceException: Object reference not
set to an instance of an object.

Source Error: 
Line 13: 	<body MS_POSITIONING="GridLayout">
Line 14: 		<form id="Form1" method="post" runat="server">
Line 15: 			<cc1:TestButton id="TestButton1" style="Z-INDEX: 101;
LEFT: 200px; POSITION: absolute; TOP: 48px" <-THIS LINE
Line 16: 				runat="server"></cc1:TestButton></form>
Line 17: 	</body>

All that i have done is place my component on the form (no code) and
set the licence key in the Global.asax.cs file (code here, but this
part seems to work fine).

The error is probably because I have no idea how to write a wrapper,
so here is the code for my wrapper. (It is a web control library)

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;

namespace ButtonComponent
{
	[DefaultProperty("Text"),
		ToolboxData("<{0}:TestButton runat=server></{0}:TestButton>")]
	public class TestButton : Xceed.Chart.Server.ChartServerControl
	{

		static public void SetKey()
		{
			Xceed.Chart.Server.Licenser.LicenseKey = "xxx";
		}
	}
}

All that i want the wrapper to do is allow me to access the regular
functions and properties of ChartServerControl component, so I thought
that this would do, obviously I was wrong.
I really have no idea what i am doing, so any help would be greatly
appreciated.
Thank you very much
Stephen

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