ASP.NET

string str = "Hi world, welcome";
foreach (char s in str)
{
  //Calculate the nos of characters here
}

string str="Hello World";
int countW = str.ToCharArray().Count<char>(c => c == 'w');

string hello = "Hello, World!!";

(from fn in
    (from ch in hello.ToCharArray()
     group ch by ch into g
     orderby g.Key
     select new Func<object>(() => {
         Console.WriteLine(g.Key + ": " + g.Count()); return null;
     }))
 select fn()).ToArray();

DateTime.Now.AddHours(5.5).Tostring("dd-mm-yyyy")