using System;
class MainClass {
public static void Main() {
string str1 = "ABCDEabcde1234567e890";
// search string
int idx = str1.IndexOf("e");
Console.WriteLine("Index of first occurrence of One: " + idx);
idx = str1.LastIndexOf("e");
Console.WriteLine("Index of last occurrence of One: " + idx);
}
}
Index of first occurrence of One: 9
Index of last occurrence of One: 17