C# Compilation Errors please help

I'm getting compilation error "The variable 'dest' is declared but never used" on following code segment
foreach( Destination dest in this.destinationList)
{
//Do something
}
the comiler seems to be know the Destination class and destinationList. Any Idea what would cause this error.

I've another compilation error in a differnt scenerio.

In my C# file ABC.cs I have two classes (let say classA and ClassB) written under the same namespace N. From my another C# file XYZ.cs I call the "using N" directive to make use of the methods in the ClassA and classB.
However, I have no problem accessing the methods of classA but for classB I get "The type or namespace name 'ClassB' could not be found (are you missing a using directive or an assembly reference?)
"
Here's how I'm calling it in XYZ.cs

using N;
classB B = new classB();
Just to provide more detail, I had the classA written previously and then I added classB to the same namespace. Are there any restrictions around that? or my Visual Studio.NET is creating this problem? I'm not sure I'm lost. Please help.

It seems that the destinationList is empty, since dest is not used. could you test the number of items in your destinationList first before you loop?