working with string

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{

string a = "Jai Baba Budhpuri ji";

Console.WriteLine(a.Length);

Console.WriteLine(a.IndexOf('p'));
Console.WriteLine(a.IndexOf('u'));

}
}
}
output as below:
20
21
13
11
How should I write code to refer and get the output for u(second placed before r).

Answer 1

In this situation you can use:
a.lastIndexOf('u'));
If you needed the index of a certain character in between two of its own,
you will need to use a loop to go through and get the nth occurrence.

Answer 2

@Jerid Derply
Not working....sir.
Error Message:
..\Playground\(18,33): error CS1061: 'string' does not contain a definition for 'lastIndexOf' and no extension method 'lastIndexOf' accepting a first argument of type 'string' could be found (are you missing a using directive or an assembly reference?)
However thanks for care and concern.