Fill datagridview combobox cell

You can either do this in the designer by setting the datasource or you can do this at load time, treating each cell inthe comboboxcolumn as an individual combobox and adding a datasource to it.

What is the data that you'd want bound and where are you getting it from? (i.e SQL, List etc)

designer route
You can either add items manually through the designer (left screen) or assigne a datasource that is already existent in the project (right screen) via editing your datagridviewcomboboxcolumn properties (top screen)

i would like to add it programatically, and i would like to add a list of values manually from the code.

Or, you can have the datasource set in the RowsAdded event of the datagridview by

Dim DataList As New List(Of String) From {"First Item", "Second Item", "Third Item"}
Dim xSender = DirectCast(sender, DataGridView)
CType(xSender.Rows(e.RowIndex).Cells(0), DataGridViewComboBoxCell).DataSource = DataList

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Again, the code above assumes that the comboboxcolumn is the first column