问一下，这个错在那里

protected void Button1_Click(object sender, EventArgs e)
    {
        if (!(TextBox1.Text == "" || TextBox2.Text == ""))
        {
            string connstr = ConfigurationManager.ConnectionStrings["OleDBconnstr"].ConnectionString;
            string ss = "select count(*) from user where usname='" + TextBox1.Text.Trim().ToString() + "' and uspass='" + TextBox2.Text.Trim().ToString() + "'";
            // cs.open();
            OleDbConnection oleconn = new OleDbConnection(connstr);
            OleDbCommand olecomm = new OleDbCommand();
            olecomm.Connection = oleconn;
             = ss;
            oleconn.Open();
            if (Convert.ToInt32(olecomm.ExecuteScalar()) > 0)
            {
                oleconn.Close();
                Session["admin"] = this.TextBox1.Text.Trim().ToString();
                Response.Write("<script>alert('欢迎你回来！');window.location.href='AddTeacher.aspx';</script>");
            }
            else
            {
                oleconn.Close();
                Response.Write("<script language=" + "\"JavaScript\"" + ">alert('用户名密码错误？')</script>");
                return;
            }
        }
        else
        {
            Response.Write("<script language=" + "\"JavaScript\"" + ">alert('请输入用户名和密码！！')</script>");
            return;
        }
}
真不知道错在那里了，sql语句也是对的啊，他老说from子句语法错误