How to change the text box date to dd/mm/yyyy format using c#

I want date in a dd/mm/yyyy format with validation in TextBox .

As I got date with dd/mm/yyyy but it will also accept 32/02/2005. Though Feb has less 30 days.

Also when I compare two textbox it will not evalute properly. eg I want TextBox2 date greater then TextBox1. So I had used

CompareValidator, & select type="date" but it will not evalute.

1.  // .cs code.....
2. private void DateSubmit_Click(object sender, System.EventArgs e)
3. {
4. DateTime date1, date2;
5. bool date1OK, date2OK;
6. date1 = new DateTime(1,1,1);
7. date2 = new DateTime(1,1,1);
8. try
9. {
10. date1 = Convert.ToDateTime(Date1.Text);
11. date1OK=true;
12. }
13. catch
14. {
15. date1OK = false;
16. }
17. try
18. {
19. date2 = Convert.ToDateTime(Date2.Text);
20. date2OK=true;
21. }
22. catch
23. {
24. date2OK = false;
25. }
26. if(date1OK && date2OK)
27. {
28. if(date1.CompareTo(date2) > -1)
29. lblResult.Text = "Date2 must be after Date1";
30. else
31. {
32. //do whatever here
33. }
34. }
35. else lblResult.Text = "Invalid date format. Please check your input in the Date1 and Date2 fields";
36. }