I want to make a method which call automatically when someone make changes in db in sqlsever. or where I have to call this? now it's in the childHub Hub class. here are my functions but not working.
We can't get more info from your code. When the data in the database is modified, you can get a message notification.
And Rule's comment is also useful, if you want get notification in time, you should use SignalR.
I found a good github repo for you, when the data was modified, it will send message to Dashboard.