Both ASP.NET Textbox and Telerik Textbox will be rendered as <input type="password" />
. <input type="password" />
is treated a little bit different than the other controls as it contains sensitive information. On every postback they are forcefully cleared.
But if there is some requirement then you can store the information and set it back.
string Password = txtPassword.Text;
txtPassword.Attributes.Add("value", Password);
Note: But I really don't recommend it.