datagrid row change

[tek1ket]

i have datagrid which its datasource should be set when it is doubleclicked. so how can i get the row change on it?
as i searched i should use the CurrencyManager, so should i put this line in form load??

myCurrencyManager = (CurrencyManager)dgridRealy.BindingContext[dvRelay, "RelayName"];
which dvRelay is dataview and contains nothing when the form loads?

if it is this right, i'll get this error
No value at index -1.

 

[tek1ket]

as i read, CurrencyManager is related to changes in moving in datasource ( forexample datatable of dataview).
so i cann't use CurrencyManager, because i want to change the value in a listbox when i move on the datagrid, forexample when the row selector(the left most part of the datagrid) changes form row one goes to row 2.nothing changes in datasource but just a the current row will differ.

any idea is appreciated