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Collection that allows only unique items in .NET?

Is there a collection in C# that will not let you add duplicate items to it? For example, with the silly class of 7 Answers...
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What are CFI directives in Gnu Assembler (GAS) used for?

There seem to be a .CFI directive after every line and also there are wide varities of these ex., .cfi_startproc , .cfi_endproc etc.. more here . ...
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Create dynamic URLs in Flask with url_for()

Half of my Flask routes requires a variable say, /<variable>/add or /<variable>/remove . How do I create links to those locations? ...
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What do the &,

Up until now I have only used database.yml with each parameter called out explicitly, in the file below it uses some characters I do not understand. What does each line and symbol(&,*, ...
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Do event handlers stop garbage collection from occurring?

If I have the following code: 4 Answers 4 ...
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Get last element of Stream/List in a one-liner

How can I get the last element of a stream or list in the following code? 6 Answers 6 ...
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MySQL: Set user variable from result of query

Is it possible to set an user variable based on the result of a query in MySQL? 4 Answers ...
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List of encodings that Node.js supports

I need to read a file which is encoded with ISO-8859-1 (also called latin1), something like this: 2 Answers ...
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“unary operator expected” error in Bash if condition

I've been trying to figure out whats wrong with this but just can't figure it out.. 4 Answers ...
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How does “make” app know default target to build if no target is specified?

Most linux apps are compiled with: 3 Answers 3 ...