How to merge lists in one big list?

[Frankdot]

I am trying to merge many lists into one but without success.

Here's what i have tried, anyone can tell me what's wrong.


List<double> tlist = new List<double>() {alist[a]};
List<double> ttlist = new List<double>() {zlist[z]};

var list = tlist.Concat(ttlist).ToList();
List<double> ulist = tlist.Union(ttlist).ToList();

Print(ulist);

I tried with concat and union but i always get an error message:

System.Collections.Generic.List`1[System.Double]

I have to mention that those lists are from another lists like:

List<double> alist = new List<double>() {xlist[y]};

for(int a = 0; a < alist.Count; a++)
{
alist[a] = (alist[a] + counter) / (someOtherInt - counter);
thank you

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