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       我将内容保存到数据库中时出现了一下错误an unknown error occurred while processing the request on the server.the status code returned from the server was:500。因为我是初次使用，不知道该怎么去找解决办法，希望各位帮忙解决一下，谢谢，一下是我调用的代码：

aspx页面：

<%@ Page Title="" Language="C#" MasterPageFile="~/Admin1/Admin.Master" AutoEventWireup="true"
    CodeBehind="_n_ggtj.aspx.cs" Inherits="SunCFarm.Web.Admin1._n_ggtj" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
    <script type="text/javascript" charset="utf-8" src="kindeditor/kindeditor.js"></script>
    <script type="text/javascript">
        KE.show({
            id: '<%=txtContents.ClientID %>',
            allowFileManager: true,
            afterCreate: function (id) {
                KE.event.ctrl(document, 13, function () {
                    KE.util.setData(id);
                    document.forms['form'].submit();
                });
                KE.event.ctrl(KE.g[id].iframeDoc, 13, function () {
                    KE.util.setData(id);
                    document.forms['form'].submit();
                });
            }

        });
    </script>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <table>
        <tr>
            <td>
                标题：
            </td>
            <td>
                <asp:TextBox ID="txtTitle" runat="server" Width="200px"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td colspan="2">
                <asp:Button ID="btnTianjia" runat="server" Text="添  加" OnClick="btnTianjia_Click" />
            </td>
        </tr>
    </table>
</asp:Content>

string str = ((TextBox)(((Button)sender).FindControl("txtContents"))).Text.ToString();

谢谢Roddy的回复，我照着那个文件修改了一下代码，但是又报了一个错，Object reference not set to an instance of an object，是不是因为我的页面应用了模板页，方法不一致？