Enumerable.Range can be used to create a sequence of numbers. By default it can create an IEnumerable<int> in the following way:
Enumerable.Range(0, 5) generates the following sequence: 0,1,2,3,4
Combining this functionality with a lambda expression you can generate any type of numbered list
doubles
Enumerable.Range(0,5).Select(n=>(double)n) generates the sequence 0.0,1.0,2.0,3.0,4.0
or an expression (function)
offset = 4.0
step =0.2
Enumerable.Range(0,5).Select(n=>offset n*step) yields 4.0, 4.2, 4.4, 4.6, 4.8
Enumerable.Repeat can be used to create a sequence of numbers that are all the same
Enumerable.Repeat(5, 3) yields 5, 5, 5
see also
http://visualstudiomagazine.com/articles/2009/04/01/make-your-code-clear.aspx
http://stevenharman.net/blog/archive/2008/02/12/ruby-has-ranges-and-so-does-c.aspx