How to reject same time data before saving to Sqlite Net Pcl

Question

basic from: https://docs.microsoft.com/en-us/samples/xamarin/xamarin-forms-samples/getstarted-notes-database/

 

In this example using DateTime.Now to save to database. Well, if I use DatePicker. Assuming the date data already exists.

How to display DisplayAlert, if the input from DataPicker is the same as previous data.

Thank you in advance.

 

#Xamarin.Forms

#Sqlite-net-pcl