In MFC, I have the following class
class COptionalVariant: public COleVariant
{
public:

I'm trying to establish table mappings, and I've hit a snag.
At the point to where I try to fill the schema (DB_adapter.FillSchema),
I get an exception, and the message is as follows:

I am using Visual Studio 2005.
I have added a DLL into GAC. I can confirm that by going to
C:\WINDOWS\assembly and see the assembly name.
Now I am trying to use the assembly by adding a reference to it. In "Add

I have a client that wants me to code a simple application as a prototype.
The catch is that he wants to use this application at several different
stores while being able to share each store's data.  He also want the
application to continue to function in the case that the internet ...

Hi Guys and gals,
I want to generate a code diagram from a c# application, but when i do the
reverse engineer thing it just creates the classes from the current projec
ready for you to create your own diagram, what i want it to do is to actually

I've started to get a bit confused by namespaces and hierarchical
organisation in general. What I want to do is something like this:
Namespace MyNamespace
   |

Let's say I create a custom component that inherits from TextBox. Then
I set the color of the textbox. Now I want it so that anyone who uses
this component can not change the color. How do i make it so that the
BackColor property is no longer able to be set (either at runtime or

I'm trying to display a text from a database, text that contains
Romanian diacritics (aîst) in a aspx page. The text has been
inserted in the database using a asp application with a HTML editor
with this setting: content-type="text/html; charset=iso-8859-2"

I have a question regarding generics:  Suppose I want to create some generic
collection classes:
Collection<Cats> c;
Collection<Dogs> d;

I am doing a length operation reading access database and creating a sql
database when I get this message.
What am I supposed to do to get around it ?
Thanks

Does anyone know how to get the Mac address of a remote PC, using C#? I
believe it's possible by deconstructing the packet received from a ping
 but I don't know how to do it.
TIA

I've extended the article "Covariance and Contravariance in Delegates" from
the C# Programmers' Guide, and it seems contravariance of delegates is
implemented wrong.
Lambda calculus states that Handler2Method is a subtype of HandlerMethod...

Need to protect a file which is written to a CD, the CD is then read on
another machine.
My App will be present on both machines and will be doing the Writing /
Reading.

I am developing with VS.NET 2003 on the ASP.NET 1.1 platform.
I don't know how to get around this 'Object reference not set to an instance
of an object' error.
How should I check to see if a session variable exists?

I am looking for a good C# book.
My background: I have half a year of professional experience with Java.
I am new to C#. Before that I have been coding a lot in Java, so I am
familiar with almost all concepts in Java (J2SE not J2EE).