How to distinct a value in a column using linq

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C#

LINQ

i want to retrive two ddl using linq in that a field named smc has duplicate values and i want to get that columns as distinct values
How to include that smc column and separate it

What I have tried:

Elastic.Search<my_log>(s => s
                               .Index(defaultIndex)
                               .Size(1000)
                               .Query(q => q
                               .DateRange(r => r
                               .Field(p => p.Time)
                               .GreaterThanOrEquals(fldFromDate)
                               .LessThan(fldToDate)
                               .TimeZone("+05:30"))
                               && q.Match(m => m.Field(f => f.fldtype).Query(fldType))
                               && q.Match(m => m.Field(f => f.fldstatus).Query(status))
                               )
                               .Sort(p => p.Descending("@time")));
                   data = (from hits in responsedata.Hits select hits.Source).ToList();