How to bind data to dropdown using entity framework

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.NET

.NET4

i have ddlCountryDropdown which display country name. I have table tblCountry which has coulmn name CountryName which i want to bind to ddlCountryDropdown at page load event.I am create one folder DTO in that i add class file MasterDTO.Cs in that i write beloqw code using entity framework.

public List<tblCountry> GetCountries()
       {

           List<tblCountry> d = null;
           using (var context = new HealthEntities())
           {
               d = context.tblCountries
                   .ToList<tblCountry>();

           }

           return d;
       }

In Default.aspx.cs how can i bind ddlCountryDropdown.