how to get single Value from Linq to string in C#

var filteredSeries = (from s in dtSeriesWithMissVal.AsEnumerable()

where (s.Field<string>("Data Descriptor").Equals(strCmbMissValue))
select new{
seriesName = s.Field<string>("Series")}).Distinct();
　

string strSeries = filteredSeries.ElementAt(0).seriesName;