How can I let the textbox only display dd/MM/yyyy on text box

 I use textbox to store "date of birth" to profile, it is fine:
 

 But when I edit profile from edit page, it display the date time as belows:
 "20/03/1977 0:00:00" in textbox, how can I remove "0:00:00 " and only display "dd/MM/yyyy"
the code as belows: 
save to profile
 Profile.DateOfBirth = DateTime.Parse(txtDateOfBirth.Text);
***sure not input "0:00:00" to the textbox 
retrieve from profile 
 txteDateOfBirth.Text = Profile.DateOfBirth.ToString();
actually display   "20/03/1977 0:00:00"
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