Based on the data in database (SQLite), I need to send scheduled notifications using Toast.
Do you really want to do it with Toast? That's Android specific and you're posting in Xamarin.Forms which makes me thing you want to do it in a more platform-agnostic way so it works on all platforms.
Maybe something like rg.plugins.popups to create cross-platform popups instead.
Can u help on this https://forums.xamarin.com/discussion/96827/how-to-send-pending-notifications-using-crosslocalnotifications-when-the-phoned-is-rebooted/p1?new=1
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