Clarte says:

Please help me, how can i realize:

It is necessary to authorized user can edit gridview(Product) only his products. Authorization is implemented on the page.   

 Add autherization to updation of gridviewrow on  rowupdating through function,and verify there,means make funstion of verification and call it from rowupdation.

Refer below Link for your reference.

Show Hide Edit Button in GridView based on Role in ASP.Net using C# and VB.Net