Basic Web API to view data

I'm writing a basic web API.  The code below is in the values controller and should put two rows from the data table into a JSON file.
How do I amend the code, so that it produces the file?
What URLs will work?

        public DataTable Get(string EmployeeName="Joe",string EmpCode="AR")

                string ConnectionString = ConfigurationManager.ConnectionStrings["WebAPIDb"].ConnectionString;
                using (SqlConnection sqlCon = new SqlConnection())
                    using (SqlCommand sqlcmd = new SqlCommand())
                        using (SqlDataAdapter sqladp = new SqlDataAdapter())
                            using (DataTable dt = new DataTable())
                                sqlCon.ConnectionString = ConnectionString;
                                sqlcmd.Connection = sqlCon;
                                sqlcmd.CommandType = CommandType.StoredProcedure;
                                sqlcmd.CommandText = "EmployeeTable";
                                sqlcmd.Parameters.AddWithValue("@Operation", "S");
                                sqlcmd.Parameters.AddWithValue("@FirstName", "Joe");
                                sqlcmd.Parameters.AddWithValue("@Empcode", "AR");
                                sqladp.SelectCommand = sqlcmd;
                                return dt;






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