Thank you to all for your answers.
My datagrid is binded to an object.
I am adding an new empty collection to the object before to bind it to the datagrid.
I have a new empty row into my datagrid, but now the problem is that the id the item is null and I cannot update or delete it.
I Developed application in C# with crystal reports and created setup file in third party (Advance) Installer.When i installed my application on client system application is working but ...