using (var context = GetContext())
            {
                Company company = new Company(companyId);
                context.Companies.Attach(company);
                company.UserName = userName;
                company.Password = password; 
                company.EMail = email;
                company.Notes = notes;
                context.SubmitChanges();
            }

    partial class Company
    {
        public Company(int companyName)
        {
            _CompanyId = companyName;
        }
    }

public static string EncodeJsDate(DateTime date)
        {
            return "new Date(\"" + date.ToString("U", new CultureInfo("en-US")) +" UTC" + "\")";
        }

this.txtImageButton.MinDate = DateTime.Now.AddDays(-1);
this.txtImageButton.MaxDate = DateTime.Now.AddDays(1);