Hi Tayyip,
Sorry for the miss-communication.
We have analyzed your code snippet and you have implemented SfDataGrid in Template. So, it is not possible to access the SfDataGrid object in code behind.
Your requirement is to update the SfDataGrid row to the respected index and this can be done if you are implemented the SfDataGrid in Code behind. By using the ScrollToRowColumn method we can scroll to the respected row. For more details please refer to the below UG link.
UG link : https://help.syncfusion.com/xamarin/datagrid/scrolling#programmatic-scrolling
Regards,
Karthik Raja