WebForm_DoPostBackWithOption未定义，奇怪的错误啊

[a810889016]

点击保存却无法保存，并且报错

<a href="NewsEditUI.aspx?action=addnew">发布新闻</a>
    <asp:ListView ID="lvNews" runat="server" DataKeyNames="Id" 
        DataSourceID="odsNews">
        
        <ItemTemplate>
            <tr style="">
                <td>
                    <asp:Button ID="DeleteButton" runat="server" CommandName="Delete" 
                    OnClientClick="return confirm('真的要删除吗？')" Text="删除" />
                    <a href='NewsEditUI.aspx?action=edit&id=<%# Eval("Id") %>>'>编辑</a>
                </td>
                <td>
                    <asp:Label ID="TitleLabel" runat="server" Text='<%# Eval("Title") %>' />
                </td>
                <td>
                    <asp:Label ID="CreateDateLabel" runat="server" 
                        Text='<%# Eval("CreateDate") %>' />
                </td>
            </tr>
        </ItemTemplate>

        <table>
            <tr>
                <td>
                    <asp:Label ID="Label1" runat="server" Text="标题"></asp:Label></td>
                <td>
                    <asp:TextBox ID="txtTitle" runat="server" MaxLength="50"></asp:TextBox>
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" 
                        ControlToValidate="txtTitle" ForeColor="Red">*</asp:RequiredFieldValidator>
                </td>
            </tr>
            <tr>
                <td>
                    <asp:Label ID="Label2" runat="server" Text="正文"></asp:Label></td>
                <td>
                    <asp:TextBox ID="txtMsg" runat="server" TextMode="MultiLine"></asp:TextBox>
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" 
                        ControlToValidate="txtMsg" ForeColor="Red">*</asp:RequiredFieldValidator>
                </td>
            </tr>
            <tr>
                <td>
                    <asp:Button ID="btnSave" runat="server" Text="保存" onclick="btnSave_Click" 
                        style="height: 21px" /></td>
                <td></td>
            </tr>
        </table>

c#代码部分

public partial class NewsEditUI : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
           
            if (IsPostBack)
            {
                string action = Request["action"];
                if (action=="addnew")
                {

                }
                else if (action=="edit") 
                {
                    int id = Convert.ToInt32(Request["id"]);
                    var newsRow = new T_NewsTableAdapter().GetDataById(id).Single();
                    txtTitle.Text = newsRow.Title;
                    txtMsg.Text = newsRow.Msg;
                }
                else
                {
                    throw new Exception("action错误："+action);
                }
                
            }
        }

        protected void btnSave_Click(object sender, EventArgs e)
        {
            if (!IsValid)
            {
                return;
            }
            string action = Request["action"];
            if (action == "addnew")
            {
                new T_NewsTableAdapter().Insert(txtTitle.Text,txtMsg.Text,DateTime.Now);
            }
            else if (action == "edit")
            {
                int id = Convert.ToInt32(Request["id"]);
                var newsRow = new T_NewsTableAdapter().GetDataById(id).Single();
                newsRow.Title = txtTitle.Text;
                newsRow.Msg = txtMsg.Text;
                new T_NewsTableAdapter().Update(newsRow);
            }
            else
            {
                throw new Exception("action错误：" + action);
            }
        }

什么问题啊

[我本良人]

if (IsPostBack)----->if (!IsPostBack)

[a810889016]

真的少了个！，我好粗心