从客户端检测到潜在危险的Request.Form值

当我尝试发布任何包含 <whatever> 的东西时，我得到了

从客户端检测到潜在危险的Request.Form值说明：请求验证已检测到潜在危险的客户端输入值，并且请求的处理已中止 . 此值可能表示尝试破坏应用程序的安全性，例如跨站点脚本攻击 . 要允许页面覆盖应用程序请求验证设置，请将httpRuntime配置部分中的requestValidationMode属性设置为requestValidationMode =“2.0” . 示例： . 设置此值后，您可以通过在Page指令或配置部分中设置validateRequest =“false”来禁用请求验证 . 但是，强烈建议您的应用程序在这种情况下明确检查所有输入 . 有关详细信息，请参阅http://go.microsoft.com/fwlink/?LinkId=153133 . 异常详细信息：System.Web.HttpRequestValidationException：从客户端检测到潜在危险的Request.Form值

我有以下asp.net代码

<asp:DetailsView ID="newsDetail" runat="server" DataSourceID="SqlDataSourceNews"
                AutoGenerateRows="False" DataKeyNames="id" 
                OnItemUpdating="NewsDetailItemUpdating" OnItemCreated="NewsDetailItemCreated"
                OnItemDeleted="NewsDetailItemDeleted" OnItemInserted="NewsDetailItemInserted"
                OnItemInserting="NewsDetailItemInserting" OnItemUpdated="NewsDetailItemUpdated"
                DefaultMode="Insert">

                <Fields>
                    <asp:TemplateField FooterText="show at statpage" HeaderText="view" SortExpression="view">
                       ...
                    </asp:TemplateField>
                    <asp:BoundField DataField="headline" HeaderText="Headline" SortExpression="headline">
                    </asp:BoundField>
                    <asp:TemplateField HeaderText="Text">
                        <ItemTemplate>
                            <asp:Label ID="post" runat="Server" Text='<%# Eval("post") %>' OnPreRender="PostLabelPreRender" />
                        </ItemTemplate>
                        <InsertItemTemplate>
                            <asp:TextBox ID="postTextBox" runat="server" Text='<%# Bind("post") %>' TextMode="MultiLine"
                                Width="500px" Height="300px" />
                        </InsertItemTemplate>
                        <EditItemTemplate>
                            <asp:TextBox ID="postTextBox" runat="server" Text='<%# Bind("post") %>' TextMode="MultiLine"
                                Width="500px" Height="300px" />
                        </EditItemTemplate>
                    </asp:TemplateField>

和代码

protected void NewsDetailItemUpdating(object sender, DetailsViewUpdateEventArgs e)
    {
        // Iterate though the values entered by the user and HTML encode 
        // the values. This helps prevent malicious values from being 
        // stored in the data source.
        for (int i = 0; i < e.NewValues.Count; i++)
            if (e.NewValues[i] != null)
                e.NewValues[i] = Server.HtmlEncode(e.NewValues[i].ToString());
    }

    protected void NewsDetailItemInserting(object sender, DetailsViewInsertEventArgs e)
    {
        for (int i = 0; i < e.Values.Count; i++)
            if (e.Values[i] != null)
                e.Values[i] = Server.HtmlEncode(e.Values[i].ToString());
    }

    protected void NewsDetailItemUpdated(object sender, DetailsViewUpdatedEventArgs e)
    {
        newsList.DataBind();
    }

    protected void NewsDetailItemInserted(object sender, DetailsViewInsertedEventArgs e)
    {
        newsList.DataBind();
    }

    protected void NewsDetailItemDeleted(object sender, DetailsViewDeletedEventArgs e)
    {
        newsList.DataBind();
    }

    protected void NewsDetailItemCreated(object sender, EventArgs e)
    {
        newsList.DataBind();
    }