i urgently need this programs so please give the answers

Question

1)c# program to find a Nth highest or lowest number in a given series of numbers

 2)Write a program to find convert the given series into Upper or case based on parameter(Should not use direct built in function

3)

.Write a program to convert first letter of each word into upper / lower case from the given string (e.g. input = "hello welcome to india", output = "Hello Welcome To India")

 4). Write a program to search/find a char(s) in a given strin