Getting Error using edmx while returning data row [] with Take<1>

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C#3.5

entity-framework

HI ,
I written below getting error can u please sujjest me, while take <> and order by functions i am getting the error


public DataTable getCountrys()
{
DataTable dtState = new DataTable();
dtState.Columns.Add("CountryName", typeof(String));
dtState.Columns.Add("CountryId", typeof(String));
dtState.AcceptChanges();
try
{
using (var entities = new edFusionRDSEntities())
{
DataRow[] _state = (from state in entities.Country.AsEnumerable()
let row=dtState.Rows.Add(
state.CountryName,
state.CountryId
)
select row).Distinct().OrderBy(d => d.Field<string>("CountryName")).Take(1).ToArray<datarow>();
if (_state.Length > 0)
_state.CopyToDataTable();
return dtState;
}
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}