Combobox DropDownList preselected item

If you want to select only a specific item at start up use this code

ComboBox1.SelectedIndex = 0 'would set it to 246mb, 1 would set to 512mb, etc.

To make you app remember which item was select when it closed and reselect it on start up you will need to first create a property in your Settings.vb file

1) Right click your project in the solution explorer (or double click on the "My Project" folder in solution explorer)
2) Click on properties
3) In the tab window that opens click on the settings tab to the left
4) Add a new property called ComboSelectedIndex and set its type to Integer

the use this code

Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
    ComboBox1.SelectedIndex = My.Settings.ComboSelectedIndex
End Sub

Private Sub Form1_FormClosing(sender As System.Object, e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
    My.Settings.ComboSelectedIndex = ComboBox1.SelectedIndex
    My.Settings.Save()
End Sub

If you need more explanation let me know and I will try to help.