Why isn't String.Join working the way I though it would?

i have following code:

public void encypt(string input)  {      int[] numarray = input.tochararray().select(x => int.parse(x.tostring())).toarray();      int[] encryptarray = new int[4];                    numarray[0] += 7;      numarray[1] += 7;      numarray[2] += 7;      numarray[3] += 7;        numarray[0] %= 10;      numarray[1] %= 10;      numarray[2] %= 10;      numarray[3] %= 10;        encryptarray[0] = numarray[2];      encryptarray[1] = numarray[3];      encryptarray[2] = numarray[0];      encryptarray[3] = numarray[1];        string output = string.join("", encryptarray.tostring());      console.writeline(output);  }  

what thought happen output string of in encryptarray array.  instead, system.int32[];

i tried this:

foreach (int digit in encryptarray)  {      output = string.join("", encryptarray.tostring());  }  console.writeline(output);

which gave me same answer , tried this:

foreach (int digit in encryptarray)  {      output = string.join("", encryptarray.tostring());      console.writeline(output);  }              

which gave me system.int32[] 4 times.

please advise why it's not working way thought would.  thank you.

hello,

if lose .tostring() string string.join method.

public string encypt(string input) {     int[] numarray = input.tochararray().select((x) => int.parse(x.tostring())).toarray();     int[] encryptarray = new int[4];      numarray[0] += 7;     numarray[1] += 7;     numarray[2] += 7;     numarray[3] += 7;      numarray[0] = numarray[0] % 10;     numarray[1] = numarray[1] % 10;     numarray[2] = numarray[2] % 10;     numarray[3] = numarray[3] % 10;      encryptarray[0] = numarray[2];     encryptarray[1] = numarray[3];     encryptarray[2] = numarray[0];     encryptarray[3] = numarray[1];      return string.join("", encryptarray);  }

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