AutoIncrement column of datagridview increments while sorting

[afsal qureshi]

I have a datagridview which is bound by a typed dataset. On the initial binding typed dataset is empty. There s autoincrement column specified on the typed dataset. The grid is readonly. But whenever I click on header the autoincrement column increments. It should have occurred only if I add a new row through the code. Can anyone tell me what is happening here? Thanks.