DropDownList1

循环绑定数据到DropDownList1

foreach (SPList ls in web.Lists)
{

LIColl.Add(ls.Title);//将数据保存list中

}

dwlist.DataSource = LIColl;//绑定
dwlist.DataBind();//绑定

默认值

DataBound事件：

protected void DropDownList1_DataBound(object sender, EventArgs e)
{
DropDownList1.Items.Insert(0, new ListItem("---请选择---", "0"));
DropDownList1.SelectedIndex = 0;
}

获取选的值

写到SelectedIndexChanged事件里面
要先把dropdownlist控件的autopostback属性改为true
private void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e)
{
this.Label3.Text=this.DropDownList2.SelectedItem.ToString();//text this.Label4.Text=this.DropDownList2.SelectedValue.ToString();//value
}
如果用按钮就可以直接写
private void Button1_Click(object sender, System.EventArgs e)
{
this.Label1.Text=this.DropDownList1.SelectedItem.ToString();
this.Label2.Text=this.DropDownList1.SelectedValue.ToString();
}