Introduction to UIController

In this section we'll:

• Create our first screen and explain it
• Retrieve data from the database, filter and sort it
• Review the life Cycle
• Validate input

UI Controller is a class that controls the UI interaction.
It is the equivalent to the Online program in the original application.

• Creating a simple screen
• Simple Screen Explained
• Getting Data From The Database
• Filtering Data
• Sorting Data
• Relations
• Using debug information in VS
• UI Controller Summary Exercise
• UI Controller Life Cycle
• Input Validation
• verify that a row exists in a relation

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