CRUD Operations in GridView Without Using Database in ASP.NET

Hi! I only need one textbox inside gridview and other operational buttons like add , edit , delete in gridview. I just need that these buttons can save the data in datatable like we do :

DataTable dt = new Datatable();

I dont want to save it in database at this stage. Just tell me how can this be done ? CRUD Operations using datatable inside gridview is my aim.

Thanks