Remove last character using TrimEnd()

You somehow create  an array using a loop  and want to sperate items with comma or etc. but everyone knows the last char of this array is one of that comma and unwant.You have to remove it. Usually we do this like

string mystring = “some,thing,in,this,array,”;

   mystring = mystring.Substring(0, mystring.Length - 1);

this is correct bu there is an easy way to do it:

   mystring = mystring.TrimEnd(',');