C#, Is there a map structure? -

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Is there a structure like c ++ maps in C #? I have a group of numbers like this:

1.234 1
5.789 0
3.445 1
...

Where to sort data based on me The requirement is the smallest number in the column, but in each column I need a number of columns to be with each respected number. After sorting it will look like this:

1.234 1
3.445 1
5.789 0
...

Any ideas? 

  sorted options & lt; Double, int & gt;

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