dropdownlist 动态改变触发某些功能

Question

dropdownlist动态改变触发某些功能  是不是用selectindexchenged 这个事件   
还有怎么获得      dropdownlist里的listItem Value="1"  的值

Answer 1

if(dropdownlist1.selectItem.value=="1")
{
 //do something
}

Answer 2

1、是用selectindexchenged 
2、用DropDownList1.SelectedValue

Answer 3

非常同意LS几位朋友的说发
UP!!

Answer 4

 AutoPostBack="True" 
protected void ddlLB_SelectedIndexChanged(object sender, EventArgs e)
    {
     string s=this.ddlLB.SelectedValue;
    }