How Insert Master-Detail DataTable Row

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C#

WinForms

master/detail

There are 2 Table:

MasterTable => Columns: ID, DetailTable_ID, Description
DetailTable => Columns: ID, Title

First I wanna add a row to DetailTable, then I wanna add a row to MasterTable that it will requires a new DetailTable row.ID which is -1.
I want to add them to DataSet not DataBase.

I'd tried this:

long movieID = long.Parse(this.Movie.SelectedValue.ToString());

Data.VMS.DataSet.MovieGenreRow row = this.VMSDataSet.MovieGenre.NewMovieGenreRow();

row.Movie_ID = movieID;


Data.VMSDataSet.GenreRow genreRow = this.VMSDataSet.Genre.NewGenreRow();

genreRow.Title = this.GenreTitle.Text;
genreRow.Description = this.GenreDescription.Text;

this.VMSDataSet.Genre.Rows.Add(genreRow);

row.Genre_ID = -1;

this.VMSDataSet.MovieGenre.Rows.Add(row);