Controlling the Input Dialog

Hi all,

i’m new at this platform so i’m trying is to creating an user using input dialog. I have 3 input dialog which they are creating a username,mail and password. What i want to is, controlling the textbox. If textbox is empty messagebox appears and says that "Cannot be empty"Ok Cancel buttons available and if user press ok then the program should ask again and how can i do that?
In the picture the program inside of the while loop while true then picture.


Hi @yigit.aybey

You can proceed like this


ControllingInputDialogue.xaml (11.2 KB)