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数据绑定转发器时发生此错误:SQL Server不处理NText,Text,Xml或Image数据类型的比较

protected void Page_Load(object sender, EventArgs e)
{
    topicid = Convert.ToInt32(Request.QueryString["topic".ToString()]);

    if (!IsPostBack)
    {
        MusicForumDataContext db = new MusicForumDataContext();

        var query = from p in db.posts
                    where p.categoryid == NAME
                    select p;
        rptposts.DataSource = query;
        rptposts.DataBind(); <---- ERROR
    }
}