dataView, defaultview, dataSet - difrences when working with grid

ok so now i have really headaque!
i have datagrid
i truely dont know which of the data object to bind the datagrid and what is the diffrences of it? (i need to view data in the grid and creat check event which retrieves the record index so i can ensure the user by record index to edit it in other place)
if i use dataview when i get selected index in the view after i filter it is not the same index in the dataset which suppose to update my database?
what is the best way???

It seems you are confusing yourself, and you didnt mention exactly why you need record index. Its obvious that if you do a filter on your dataset then the rows in your dataview are indexed from 0 to the count of rows and this index may not correspond to the index of rows in your dataset, and if you change the sorting then everything changes again. Dataview is the top most view of datasets, so you can change the way your data in a dataset are shown, and manipulate it, for example you may like to view the deleted rows, so you set the rowsate to 'deleted' .