C# Hashtable ........

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C#

i am reading the .csv file then is thows exception " an item with the same key has allready been added.

when ever i am setting the

true to false then it executing but i want to add header.

var csv = new CsvReader(new StreamReader(stream), true)
             {
                 MissingFieldAction = MissingFieldAction.ReplaceByNull
             };