1、常用属性
(1)DropDownStyle            组合框的样式
(2)SelectedIndex              当前选定项的索引
(3)SelectedItem                当前选定项
(4)Itmes                             该组合框中所包含项的集合
 
2、Items的属性和方法
(1)count        集合中项个数
(2)Add          添加一个项
(3)Clear       清空所有项
(4)Contains   确定指定项是否在集合中
(5)RemoveAt        删除集合中指定索引处的项
 
 
例:
 
Public Class Form1
    Private Sub 载入数据_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 载入数据.Click
        Dim i As Integer
        For i = 1 To 10
            ComboBox1.Items.Add(i)
        Next
    End Sub  
    Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
        MsgBox("当前选中项的索引值为:" & ComboBox1.SelectedIndex)
        MsgBox("当前选中项为:" & ComboBox1.SelectedItem)
    End Sub
    Private Sub 删除当前选中项_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles 删除当前选中项.Click
        ComboBox1.Items.RemoveAt(ComboBox1.SelectedIndex)
    End Sub
End Class