private void getName()
    {
      
            this.DropDownList1.DataSource =DropDownList1();
            this.DropDownList1.DataValueField = "id";
            this.DropDownList1.DataTextField = "name";
            this.DropDownList1.DataBind();
            this.DropDownList1.Items.Insert(0, new ListItem("--请选择--", "0"));
            this.DropDownList2.Items.Insert(0, new ListItem("--请选择--", "0"));
            this.DropDownList3.Items.Insert(0, new ListItem("--请选择--", "0"));


      
    }
//点击第一级获得第二级数据
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
          string id = this.DropDownList1.SelectedValue;

            this.DropDownList2.DataSource =GetDropDownList2(id);
            this.DropDownList2.DataValueField = "id";
            this.DropDownList2.DataTextField = "name";
            this.DropDownList2.DataBind();
            this.DropDownList3.Items.Insert(0, new ListItem("--请选择--", "0"));   

    }
//点击第二级获得第三级数据
    protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
    {

            string id = this.DropDownList2.SelectedValue;
            this.DropDownList3.DataSource = GetDropDownList3(id);
            this.DropDownList3.DataTextField = "name";
            this.DropDownList3.DataValueField = "id";
            this.DropDownList3.DataBind();
            this.DropDownList3.Items.Insert(0, new ListItem("--请选择--", "0"));

       
    }