So I have just started vb.net and I am making an emailer but I want to know how I can use a combobox or checkbox to automatically add @gmail.com or @ live.com. This way the user only has to enter there username for there specified email

>how I can use a combobox or checkbox to automatically add @gmail.com or @ live.com.

You need to store both username and email into database and fetch corresponding email from the database when user input username.

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