The rows in the Selected.Rows collection will be in the order in which they were selected. But I imagine you probably want them in the order in which they appear in the grid.

moojoo said:

I tried to sort the selected rows using LINQ by row.Index but it does not seem to work because the row indices seem to change every time the user drags the selection.

That's the hard way to do it. The easy way is to call:

this.ultraGrid1.Selected.Rows.Sort();

 

moojoo said:

But the SelectedRowsCollection does not save the order so I get inpredictable results when dragging the rows (like the new order is 9,6,12 and 3).

The SelectedRowsCollection does actually preserve the order in which the rows were selected. I looked at the KB article and it would seem that after the RowsCollection.Move method is called, the 'dropIndex' stack variable will no longer reference the same row (that it did before the first call to the Move method) because the act of moving the row can potentially change the indexes of the drop row and any other rows between that row and the ones being dropped. I'm not sure if this will work, but you might want to try updating that dropIndex with each call to the Move method, i.e., hold a reference to that drop row, and check its Index property with each iteration, rather than a stored value.