convert string to datetime
string datestring = “18 March 2008″;
DateTime parseddate = Convert.ToDateTime(datestring);
Response.Write(parseddate);
convert datetime to string

Change page title and meta tags dynamically/programmatically in C#.net
to change page title
Page.Title = “New Page Title”;

Problem

There is a .aspx page with some textbox and a submit button.
User enters text in the textbox and clicks the submit button.