How to pass variable number of arguments using Params in c#?

If we want to pass variable number of arguments from calling function to called function, we can use the Params Arrays
e.g.

public class ParamTest
{
        static void Main()
        {
                //calling function
                PerformArithmeticOperation(20,10,"+"); //perform addition
                PerformArithmeticOperation(20,10,"-"); //perform subtraction
                PerformArithmeticOperation(20,10,"*"); //perform multiplication
                PerformArithmeticOperation(20,10,"/"); //perform division
        }

        //called function
        public static void PerformArithmeticOperation(params object[] items)
        {        
          var result = 0;
          switch (Convert.ToString(items[2]))   //items[2] is the operator(s) i.e. +,-,*,/
         {
         case '+': result = Convert.ToInt32(items[0]) + Convert.ToInt32(items[1]); break;
         case '-': result = Convert.ToInt32(items[0]) - Convert.ToInt32(items[1]); break;
         case '*': result = Convert.ToInt32(items[0]) * Convert.ToInt32(items[1]); break;
         case '/': result = Convert.ToInt32(items[0]) / Convert.ToInt32(items[1]); break;
                                
        }
         Console.WriteLine(result);             
        }
}