原創--gridview中的drowDownList事件，能區分每個dropDownList的事件

    <form id="form1" runat="server">
    <div>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" OnRowDataBound="GridView1_RowDataBound">
            <Columns>
            <asp:BoundField DataField="order_no" HeaderText="order_no" SortExpression="order_no" ReadOnly =True  />
            <asp:TemplateField>
                    <ItemTemplate>
                        <asp:DropDownList ID="ddl_province" OnSelectedIndexChanged="ddl_SelectedIndexChanged" runat="server"  >
                            <asp:ListItem>Y</asp:ListItem>
                            <asp:ListItem>N</asp:ListItem>
                        </asp:DropDownList>
                        <asp:Label ID="Label1" runat="server" Text='<%# Eval("order_no") %>' ></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
              
            </Columns>
        </asp:GridView>
       
       
        &nbsp; &nbsp;
   
    </div>
    </form>

cs內的代碼：

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            getlist();
        }
    }
    private void getlist()
    {
        DataHelper func = new DataHelper();
        DataSet ds = new DataSet();
        ds = func.ExctuteDataSet("Select top 5 order_no from setBBB");
        this.GridView1.DataSource = ds;
        this.GridView1.DataBind();
    }
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            DropDownList ddl = e.Row.FindControl("ddl_province") as DropDownList;
            if (ddl != null)
            {
                ddl.AutoPostBack = true;
                ddl.SelectedIndexChanged += new EventHandler(ddl_SelectedIndexChanged);
            }
        }
    }
    protected void ddl_SelectedIndexChanged(object sender, System.EventArgs e)
    {
        DropDownList Drp=(DropDownList)sender;
        string region = Drp.SelectedItem.Value;
        Response.Write(region);

        DropDownList ddl = sender as DropDownList;
        if (ddl != null)
        {
            TableCell cell = ddl.Parent as TableCell;
            if (cell != null)
            {
                Label lbl = cell.FindControl("Label1") as Label;
                Response.Write("</br>" + lbl.Text);        
        
            }
        }
        
    }