Difference between .ActiveControl and .Focus and what each does

Question

Hello I am a currently learning C# and added this to my code

InitializeComponent();
this.ActiveControl = txtUsername;
txtUsername.Focus();

What does do and what does this.ActiveControl .Focusdo and whats the difference

Thank you for your time

Answer 1

They can both do the same thing effectively. One requires a visible element while the other does not. This can be used to place cursor input on txtUsername when the form appears.

this.ActiveControl = txtUsername;

This will do the same thing if the txtUsername control is visible.

txtUsername.Focus();

The key is that the element must be visible in order for the Focus() method to work. See this for further information.