How to change the format of date in ASP.NET?

I have two textboxes: TextBox1, TextBox2, and a button Button1. I want to insert a random date into TextBox1开发者_JAVA百科 (format -- dd/mm/yyyy) and after clicking the button I want to convert the inserted date into different format (yyyy/mm/dd).

How do I get this behavior?

To parse the date that was set into the first TextBox:

var parsedDateTime = DateTime.ParseExact(
    textBox1.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture);

To set the same date to the second TextBox, but in different format:

var textBox2.Text = parsedDateTime.ToString("yyyy/MM/dd");

[Edit] As was found out the format is not dd/MM/yyyy, it is d/M/yyyy:

var textBox1 = new TextBox { Text = "2/3/2004" };
var parsedDateTime = DateTime.ParseExact(textBox1.Text, "d/M/yyyy", CultureInfo.InvariantCulture);

var textBox2 = new TextBox();
textBox2.Text = parsedDateTime.ToString("yyyy/MM/dd");

Try this. Documented nicely on MSDN.