1. Connect to the Access database by Data Source Configuration wizard. Take an example as DataGridView control on a form. In the DataSource property, click Add Project Data Source, choose Database and New Connection and the Microsoft Access Database File. The default database of the wizard is SQL Server database, you have to change the defaut to Access file. After you text the connection correctly, just choose the columns in the table you want to show in the DataGridView control.
2. Connect to Access database by code:
Dim conn AsNew OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Clients.mdb")
Dim cmd AsNew OleDbCommand
cmd.Connection = conn
cmd.CommandType = CommandType.Text
cmd.CommandText = "Select distinct ClientName from OrderClient"
Dim dr AsNew OleDbDataAdapter(cmd)
Me.btnFillListBox.Enabled = True
Catch ex As Exception
If you don't understand some of the objects or methods such as OleDbConnection, OleDbDataAdapter.Fill, please take a look up in MSDN on the related instructions.