I am not shown the data from DB Firebase

[Still-learning]

can you show us your firebase structure?

if not, use this method

How to get whole json structure value from firebase in a lable or web view

If you have no authentication rules then you could use Web component. Set Web1.Url to https://<PROJECTID>.firebaseio.com/.json? and then when Web1.GotText set label to get responce content

and by using dictionary method easily you can get each tag values properly

ref:

Fetching data from Firebase in Listview

[Capture] is there a way to sort the list in descending order by using the data of water level?