asp.net gridview rowcommand事件
想要的效果就是点击删除按钮，弹出一个隐藏层，在层内输入密码并验证正确后，删除相应的记录
现在是点击删除后一闪，能看到div层 然后就直接提示密码错误，跳转到gridview列表

<asp:ImageButton CommandArgument='<%#Eval("id") %>' CommandName='Del' OnClientClick="showDiv()" ID="ImageButton1" runat="server" ImageUrl="images/gtk-del.png" AlternateText="删除" />

层
<div id="popDiv" class="mydiv" style="display:none;">
密码：<asp:TextBox ID="TextBox1" runat="server" TextMode="Password" ></asp:TextBox>
<br />
<asp:Button ID="BttLogin" runat="server" Text=" 提 交 " OnClick="BttLogin_Click" />
<asp:Button ID="Button1" runat="server" Text=" 取 消 " OnClientClick="closeDiv()" />
</div>

后台代码
if (e.CommandName == "Del")
            {
                string username = HttpUtility.HtmlDecode(Response.Cookies["adminName"].Value);

                string strSQL2 = "select * from admin where uname = '" + username + "' and pwd = '" + cls.MD5(TextBox1.Text.Trim()) + "'";

                DataTable dt2 = cls.GetDataTable(strSQL2);

                if (dt2.Rows.Count > 0)
                {
                    DataTable dt = cls.GetDataTable("SELECT * FROM list WHERE id = '" + e.CommandArgument.ToString() + "')");

                    dt.Dispose();

                    string strSQL = "Delete From list Where id  = " + e.CommandArgument;

                    if (cls.GetSQLExecuteRows(strSQL) != -1)
                    {
                        cls.MsgBox("信息删除成功！");
                    }
                    else
                    {
                        cls.MsgBox("出现错误！", "Back");
                    }
            &nb