.net - How to declare dynamic array in c# -

i working on silverligth5 (my previous experience c++)and have create dynamic array size decided dynamically.

until have static , it's this:

string[] position = new string[20]; //it must dynamic don't want fix 20  (int = 0; < pv.root.parameter.count; i++)   {     if (name == pv.root.parameter[i].name)      {         position[i] = name;     }  } 

as can seen way have size 20 , want of same length pv.root.parameter.count.

how achieve ?

edit/ problem when try achieve through list : have problem @ line :

if (pv.root.parameter[loopcount].name == position[loopcount]) {     rowgrid.opacity=0.3; } 

because surely not work position[loopcount] because position list , cannot indexed this. how index ?

pass pv.root.parameter.count instead of 20 array length.

string[] position = new string[pv.root.parameter.count]; 

or use list, if don't want fixed size.