use ListBox, for example
<script language="C#" runat="server">
void Page_Load(Object sender, EventArgs e)
{
ListItem li = new ListItem("1","1");
li.Selected = true;
listbox1.Items.Add(li); li = new ListItem("2","2");
li.Selected = true;
listbox1.Items.Add(li); li = new ListItem("3","3");
listbox1.Items.Add(li);}
</script>
<form runat="server">
<asp:ListBox SelectionMode="multiple" id="listbox1" runat="server" />
</form>
<script language="C#" runat="server">
void Page_Load(Object sender, EventArgs e)
{
ListItem li = new ListItem("1","1");
li.Selected = true;
listbox1.Items.Add(li); li = new ListItem("2","2");
li.Selected = true;
listbox1.Items.Add(li); li = new ListItem("3","3");
listbox1.Items.Add(li);}
</script>
<form runat="server">
<asp:ListBox SelectionMode="multiple" id="listbox1" runat="server" />
</form>
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<select id="sel">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
</select>
<input type="button" value="change to multiple" onclick="sel.multiple=true;">
<input type="button" value="select 2" onclick="sel.options[0].selected = true; sel.options[1].selected = true;">
op.insertArea(ddlQY.SelectedItem.Value.Trim(),ddlQY.SelectedItem.Text.Trim(),lbXZ.SelectedItem.Value.Trim(),lbXZ.SelectedItem.Text.Trim(),lbHL.SelectedItem.Value.Trim(),lbHL.SelectedItem.Text.Trim());public void insertArea(string QYID,string QYMC,string XZID,string XZMC,string HLID,string HLMC)
{
Classes.Connect db=new Classes.Connect();
db.Open();
string strSql="insert into Areas(QYID,QYMC,XZID,XZMC,HLID,HLMC) values(@QYID,@QYMC,@XZID,@XZMC,@HLID,@HLMC)";
SqlCommand cm=new SqlCommand(strSql,db.con);
cm.Parameters.Add(new SqlParameter("@QYID",SqlDbType.BigInt,4));
cm.Parameters["@QYID"].Value=QYID;
cm.Parameters.Add(new SqlParameter("@QYMC",SqlDbType.NVarChar,20));
cm.Parameters["@QYMC"].Value=QYMC;
cm.Parameters.Add(new SqlParameter("@XZID",SqlDbType.BigInt,4));
cm.Parameters["@XZID"].Value=XZID;
cm.Parameters.Add(new SqlParameter("@XZMC",SqlDbType.NVarChar,20));
cm.Parameters["@XZMC"].Value=XZMC; //???????这里存在如何写语句的问题
...
cm.ExecuteNonQuery();
db.Close();
}
foreach(ListItem li in lbHL.Items)
{
if (li.Selected)
str +="," + li.Text;
}if (str.Length > 0)
str = str.Substring(1);