使用DataSet删除

Question

我想知道下面示例中的删除行ds.Tables[0].Rows[1].Delete();。我想在第二行删除删除命令与脚本"DELETE FROM Person WHERE PersonId = @PersonId"和参数@PersonId一起使用。但传递给@PersonId参数的是什么？根据我的理解陈述ds.Tables[0].Rows[1].Delete()表示删除table[0]的第二行，为什么它需要@PersonId？

static void DataSetUpdateDelete()
{
    SqlConnection cn = new SqlConnection();
    cn.ConnectionString = "Server = GM\\SQLEXPRESS; Database = Reflection; Trusted_Connection = True;";
    cn.Open();

    SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM Person", cn);

    //Create the update command
    SqlCommand update = new SqlCommand();
    update.Connection = cn;
    update.CommandType = CommandType.Text;
    update.CommandText = "UPDATE Person SET FirstName = @FirstName, LastName = @LastName WHERE PersonId = @PersonId";

    //Create the parameters
    update.Parameters.Add(new SqlParameter("@FirstName", SqlDbType.VarChar, 50, "FirstName"));
    update.Parameters.Add(new SqlParameter("@LastName", SqlDbType.VarChar, 50, "LastName"));
    update.Parameters.Add(new SqlParameter("@PersonId", SqlDbType.Int, 0, "PersonId"));

    //Create the delete command
    SqlCommand delete = new SqlCommand();
    delete.Connection = cn;
    delete.CommandType = CommandType.Text;
    delete.CommandText = "DELETE FROM Person WHERE PersonId = @PersonId";

    //Create the parameters
    SqlParameter deleteParameter = new SqlParameter("@PersonId", SqlDbType.Int, 0, "PersonId");
    deleteParameter.SourceVersion = DataRowVersion.Original;
    delete.Parameters.Add(deleteParameter);

    //Associate the update and delete commands with the DataAdapter.
    da.UpdateCommand = update;
    da.DeleteCommand = delete;

    //Get the data.
    DataSet ds = new DataSet();
    da.Fill(ds, "Person");

    //Update the first row
    ds.Tables[0].Rows[0]["FirstName"] = "Jack";
    ds.Tables[0].Rows[0]["LastName"] = "Johnson";

    //Delete the second row.
    ds.Tables[0].Rows[1].Delete();

    //Updat the database.
    da.Update(ds.Tables[0]);

    cn.Close();
}