Error: Name DataSet.Tables Not Allowed . Problems With Inserting

string fileName = "d:\shiporder.xml";

DataSet dataSet =  new DataSet();

dataSet.ReadXML(fileName);

//connection string

string cmd = "INSERT INTO Orders (OrderID, OrderPerson) VALUES (dataSet.Tables[0].Row[0][0].ToString(),dataSet.Tables[0].Row[0][1].ToString);

SqlConnection con = new SqlConnection(conection string);

SqlCommand mycmd = new SqlCommand(cmd,con);

con.Open();

mycmd.ExecuteNonQuery();

con.Close();

it gives me this error

dataSet.Tables its not permitted in this context. valid expression are constants, constant expression, . Columns name are not permitted