DateTime Formats in C#

DateTime Formats in C#

string appdate = System.DateTime.Now.ToString("M/d/yyyy");
string time=DateTime.Now.ToString("hhmmtt");

string fileName = DateTime.Now.ToShortDateString().Replace("/","-") ;

string appdate=DateTime.ParseExact(txtAppDate.Text, "M/d/yyyy", new System.Globalization.DateTimeFormatInfo()).ToString("M/d/yyyy");