password auto off

 txtPassword.Attributes["AUTOCOMPLETE"] = "off";

Viewstate entity

 //view state declaration
    List<CheckVoucher> viewStateCheckVoucher
    {
        get { return (List<CheckVoucher>)ViewState["CheckVoucher"]; }
        set { ViewState["CheckVoucher"] = value; }
    }

in page load initialize
 if (viewStateCheckVoucher == null) viewStateCheckVoucher = new List<CheckVoucher>();//view state initialisation

Date Time Format

INSERT TIME

 RegisteredOn = DateTime.ParseExact(txtRegisteredOn.Text, "dd-MM-yyyy", CultureInfo.InvariantCulture),

RETRIVE TIME

txtRegisteredOn.Text = company.RegisteredOn.ToString("dd-MM-yyyy");