Compare two char arrays

hi 

so im new c# , im trying figur out have problem. want compare 2 char arrays 1 string converted array (textinputtecken) , other 1 char array containing vowels (vokaler). want change vowels in textinputtecken letter i, have way of doing without char array vowels (vokaler). 

            (int = 0; < textinputtecken.length; i++)              {                  if (textinputtecken[i] == 'a' || textinputtecken[i] == 'e' || textinputtecken[i] == 'i' || textinputtecken[i] == 'o' || textinputtecken[i] == 'u' || textinputtecken[i] == 'y' || textinputtecken[i] == 'å' || textinputtecken[i] == 'ä' || textinputtecken[i] == 'ö' || textinputtecken[i] == 'a' || textinputtecken[i] == 'e' || textinputtecken[i] == 'i' || textinputtecken[i] == 'o' || textinputtecken[i] == 'u' || textinputtecken[i] == 'y' || textinputtecken[i] == 'Å' || textinputtecken[i] == 'Ä' || textinputtecken[i] == 'Ö')                  {                      nya = textinput.replace("a", "i").replace("e", "i").replace("o", "i").replace("u", "i").replace("y", "i").replace("å", "i").replace("ä", "i").replace("ö", "i").replace("a", "i").replace("e", "i").replace("i", "i").replace("o", "i").replace("u", "i").replace("y", "i").replace("Å", "i").replace("Ä", "i").replace("Ö", "i");                      txtconvert.text = nya;                      total++;                      lblvokalantal.text = total.tostring() + " vokaler";                  }              }

i have tried doing doesnt work. how can work?

            char[] vokaler = new char[] { 'a', 'a', 'e', 'e', 'i', 'i', 'o', 'o', 'u', 'u', 'y', 'y', 'å', 'Å', 'ä', 'Ä', 'ö', 'Ö' };                (int = 0; < textinputtecken.length; i++)              {                  if (textinputtecken[i] == vokaler[i])                  {                      nya = textinput.replace("a", "i").replace("e", "i").replace("o", "i").replace("u", "i").replace("y", "i").replace("å", "i").replace("ä", "i").replace("ö", "i").replace("a", "i").replace("e", "i").replace("i", "i").replace("o", "i").replace("u", "i").replace("y", "i").replace("Å", "i").replace("Ä", "i").replace("Ö", "i");                      txtconvert.text = nya;                      total++;                      lblvokalantal.text = total.tostring() + " vokaler";                  }              }

or using replace():

namespace consolecs {     using system;      public class program     {         static void main(string[] args)         {             char[] vokaler = new char[] { 'a', 'a', 'e', 'e', 'i', 'i', 'o', 'o', 'u', 'u', 'y', 'y', 'å', 'Å', 'ä', 'Ä', 'ö', 'Ö' };             char[] textinputtecken = new char[] { 'a', 'b', 'c', 'd', 'e' };             string dummy = new string(textinputtecken);                         (int v = 0; v < vokaler.length; v++)             {                 dummy= dummy.replace(vokaler[v], 'x');             }              textinputtecken = dummy.tochararray();             console.writeline("result {0}.", new string(textinputtecken));              console.writeline("done.");             console.readline();         }     } }

some minor additions:
- not nessesary translate string char[]. indexers in .net class scope functions , string has them. can use indexers on string itself. other way around nessesary. of course string have constructor takes char[] input, easy.

- using non-english characters. such, normalisation might issue when doing this. might issues far creating array string. make part or run issues:
https://msdn.microsoft.com/en-us/library/8eaxk1x2.aspx

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