Do you have to call .Save() when modifying a application setting that is bound to a control property?

If you want it to be saved automatically, bind a handler to the TextChanged event and call Save() in it. It's just a double click and typing one line of code.

Yes, you need to call Save explicitly. The binding changes the setting value in memory, but doesn't save the file.

It is common practice to call Properties.Settings.Default.Save(); when close the application (for example, in FormClosing event).

This is my thought. But, will this cause problems if there are multiple instances of the same application? – Michael Jun 19 at 6:49.

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