Repeater事件OnItemCommand取得行内控件的方法

<table>
    <asp:Repeater ID="rptList" runat="server"OnItemCommand="rptList_ItemCommand">
    <ItemTemplate>
<tr>
    <td><asp:TextBox ID="txtNum" runat="server" Text='<%#Eval("ProNum")%>'></asp:TextBox></td>
    <td><asp:Button ID="btnUpdate" runat="server" Text="更新"CommandName="update" CommandArgument='<%#Eval("PID") %>' /></td>
</tr>
    </ItemTemplate>
    </asp:Repeater>
</table>

protected void rptList_ItemCommand(object source, RepeaterCommandEventArgs e)
{
    switch (e.CommandName)
     {
        case "update":
            string arg = e.CommandArgument.ToString();//取得参数
            //找到激发事件的行内控件，这个很有用，能将更多需要的参数值传递过来。
             TextBox txtNum = e.Item.FindControl("txtNum") as TextBox;

            //下面执行业务逻辑
            string jsStr = "<script>alert('删除成功!" + txtNum.Text + "')</script>";
             Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", jsStr,false);
            break;
     }
     Bind();
}