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    protected void ButtonAddDevTools_Click(object sender, EventArgs e)
        foreach (var vItem in ListBoxDevTools.Items)
            if (ValueAlreadyInListDevTools(vItem))

            new ListItem(
                DropDownListDevTools.SelectedItem.ToString() + " - " +

    private bool ValueAlreadyInListDevTools(object vItem)
        var strCurrent = DropDownListDevTools.SelectedItem.ToString() + " - " +

        return strCurrent == vItem.ToString();
share|improve this question

When I look at your code, I see that when the item is not in ListBoxDatabases, you add a new ListItem. This is not the same object as the DropDownListDB.SelectedItem (you create a new different object) So everytime you get there, you'll just add a new entry.

share|improve this answer
So is (ListBoxDatabases.Items.Contains(DropDownListDB.SelectedItem) == false) better? – Kristian Salov Mar 13 '13 at 13:02

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