The error is pointing to this line:
myCommand.Parameters("@id").Value = Me.grdProducts.DataKeys(CInt(e.Item.ItemIndex))

Error message is:
"Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

I have done the following trying to solve this problem but nothing yet:
I have added a primary key to my table.
I have added a column to my grid to display the primary key field.

Any suggestions?