check to see if var is initialized in c#

I didn't see a C# category, so I'll ask here.
If I have a variable in c# as an xmldocument, I want to know if it has been initialized or not with a constructor.  in the debug window it is set to nothing until it is initialized.  How do you check for that in code?
LVL 3
jrspanoAsked:
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naveenkohliConnect With a Mentor Commented:
every variable that is of type class, is initialized to null unless you explictly initialize it caling new. XmlDocument object will also be null. so as rtenhove said... check if it == null or not.
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rtenhoveCommented:
You'd probably do better in the Java forum, since C# is more closely related to Java than C/C++.

At a guess, I'd say you want something like:

if (var == null)
{
    // ... whatever.
}
else
{
    // safe to use var.
}
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jrspanoAuthor Commented:
thanks that worked.  don't know why I didn't do that to start with???
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