c#怎样循环得到ListBox已选择的项

int n = ListBox1.Items.Count;
for (int i = 0; i < n; i++)
{
if (ListBox1.Items[i].Selected)
{
string txt = "您选择的是： "+ListBox1.Items[i].Text;

Response.Write(txt);
}
}

不用进行详细解释了吧？应该能看懂！

string s = "";
foreach (string x in listBox1.SelectedItems)
{
s += x;
s += "\n";
}
MessageBox.Show(s);

for (int i = 0; i < this.LBList.Items.Count; i++)
{
str = str + this.LBList.Items[i].Value + ",";
}

for (int i = 0; i < listBox1.SelectedItems.Count; i++)
{
string text = listBox1.SelectedItems[i].ToString();
}