div>
asp:ListBox ID="ListBox1" runat="server" Height="123px" Width="113px" SelectionMode="Multiple">
asp:ListItem>tom/asp:ListItem>
asp:ListItem>jion/asp:ListItem>
asp:ListItem>j/asp:ListItem>
asp:ListItem>l/asp:ListItem>
asp:ListItem>k/asp:ListItem>
/asp:ListBox>
nbsp;asp:Button ID="btnAdd" runat="server" OnClick="btnAdd_Click" Text="添加" />
nbsp;
asp:Button ID="btnRemove" runat="server" Text="移除" OnClick="btnRemove_Click" />
nbsp;asp:ListBox ID="ListBox2" runat="server" Height="123px" SelectionMode="Multiple" Width="113px">/asp:ListBox>
/div>

protected void btnAdd_Click(object sender, EventArgs e)
{
#region listbox添加记录的一种错误理解
//选择多条记录的时候,会有一条没有被添加,这是因为当一条记录被移除后,原来的第二条记录的index为0
//for (int i = 0; i ListBox1.Items.Count; i++)
//{
// if (ListBox1.Items[i].Selected == true)
// {
// ListBox2.Items.Add(ListBox1.SelectedValue);
// ListBox1.Items.Remove(ListBox1.SelectedValue);
// }
//}
#endregion
#region listbox利用index索引号进行添加的简单写法
//while (0 = ListBox1.SelectedIndex)
//{
// ListBox2.Items.Add(ListBox1.SelectedItem);
// ListBox1.Items.Remove(ListBox1.SelectedItem);
//}
#endregion
#region listbox的另一种成功添加方法
ListListItem> list = new ListListItem>();
for (int i = ListBox1.Items.Count - 1; i >= 0; i--)
{
if (ListBox1.Items[i].Selected == true)
{
list.Add(ListBox1.Items[i]);
ListBox1.Items.Remove(ListBox1.Items[i]);
}
}
for (int i = 0; i =list.Count - 1; i++)
{
ListBox2.Items.Add(list[i]);
}
#endregion
}
protected void btnRemove_Click(object sender, EventArgs e)
{
while (0 = ListBox2.SelectedIndex)
{
ListBox1.Items.Add(ListBox2.SelectedItem);
ListBox2.Items.Remove(ListBox2.SelectedItem);
}
}