Get data from database in dropdown list - C#

I think you could add the data source first, must be in the data menu, it will open an intuitive wizard to make the data bind, if you're using SQL first you have to test connection to your database, if you're using other sources add your data file to your project, then when you add your drop down list control, like a combo box for example, in the right upper corner you'll see a little arrow with a menu strip there you can add your source, check the option to make a data binding and then select your data source and the field you want to bind, this should add a Binding Source to your project, with this control you can even filter your data, and if you add another control and you use your new binding source as a source to that control it links the fields automatically.

As you see, by doing it this way you dont need any code.

Hope it helps.