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ASP.NET server control doesn't add/display the value in a password textbox because of security concerns. On most of the web sites at the time of registration password is asked. You must have noticed after submitting the page if you are again redirected to the page due to unsuccessful registration value of password field is lost.This is due to security concerns as everything is gets rendered on the client side So when you view the source in the browser password value will be there.
Add an attribute to textbox.Add this following line of code when you want set the value
But if explicitly you want to set the value of password text box again then use following method in .NET 2.0
txtPassword.Attributes["value"] = Request.Form[txtPassword.ClientID]; //in C#.Net 2.0