What is difference between RowIndex and DataItemIndex?

Question

In gridview’s RowDataBound event has e.Row.RowIndex and e.Row.DataItemIndex properties.
Please tell me in easily understandable answer, what is difference between them?
In which situation we should use which one?

Answer 1

Use the DataItemIndex property to determine the index of the DataItem in the underlying DataSet.
Use the RowIndex property to determine the index of the GridViewRow object in the Rows collection of a GridView control.

Answer 2

e.Row.RowIndex return the index of the row that is currently under binding

e.Row.DataItemIndex contains all the data indexes of the rows that is currently under binding.