Array to dictionary

Question

I have  array contains {[Name][Age],[Marks]}.I want to add the marks into dictionary .How can I?

var tableEnumerable = dt.AsEnumerable();
 var tableArray = tableEnumerable.ToArray();
                        foreach (var data in tableArray)
                        {
                          lst.Add(data["Name"].ToString(),data["Age"] as string);

                        }