Databases
StackOverflow2013
Usersdbo
USKeithS
 

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      1. POThreadSafe LinkedList Implementation
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    1. COIsn't that what Enabled/Visible is for? If the user cannot use the item, then either disable it, which Windows will render in a fairly unambiguous way, or hide it altogether. In most end-user apps, the user doesn't want to see a whole bunch of things they can't do, and neither do their supervisors (because the supervisors will invariably end up fielding requests/complaints along the lines of "why don't I have permission to do this?")
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    2. COA Dictionary is a collection, like a list or array, but its objects are key-value pairs, and you can get an element out of the collection by specifying a key. The key can be any identifying information you want to be able to use to look up a value. Think of it like a phone book; you find a person's number by looking for their name. Most dictionary implementations allow only one key and don't elegantly support independent retrieval by index; however, it is possible to do so.
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    3. COThis would be it. Make Bar generic (the type parameter can be T as well, or U, or whatever) and use the type parameter to keep Foo open. You can do this as far up the container hierarchy as you have control; however, at some point you will have to close the generic implementation with a concrete type in order to consume the class(es). If you want to do that dynamically, you can use reflection to instantiate a generic object closed to a type identified by a Type object or a string, but this can get messy real quick.
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