ADO.NET what type returns query?

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C#

Hello!
I made connect to sql server and now try get all notes of table and after getting send object result direct to datagridview. Thence there is question: what type returns query ADO?
I use the next method:

public static Get()
      {
      SqlCeCommand command = new SqlCeCommand("SELECT * FROM Students");
      return rdr = cmd.ExecuteReader();

      }

But i dont know what return type specify for function Get(). This must return result that be added to Grid (I use N-tires structure).
Sorry for question