How do i correct the auto date in my application show the current time and date (ASP.NET C#)

Hi please i have a textbox that generates a date and time, but the problem i have is that the date is not correct, it generates a wrong date. Please what do i do?
This is the date and time it generated 
: 9/9/2014 16:05:07

But the correct date and time is:
9/15/2014 9:11
Here is the code:
public partial class Sales : System.Web.UI.Page { DateTime dt = new DateTime(2014, 9, 9, 16, 5, 7, 123);
protected void Page_Load(object sender, EventArgs e) {
txtDate.Text = String.Format("{0:d/M/yyyy HH:mm:ss}", dt);