为什么user附近有语法错误

using System;
using System.Collections;
using
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

namespace zyp
{
    /// <summary>
    /// login 的摘要说明。
    /// </summary>
    public class login : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.Label Label1;
        protected System.Web.UI.WebControls.Label Label2;
        protected System.Web.UI.WebControls.TextBox textuser;
        protected System.Web.UI.WebControls.RadioButton rbtnsupper;
        protected System.Web.UI.WebControls.RadioButton rbtnsystem;
        protected System.Web.UI.WebControls.RadioButton rbtnuser;
        protected System.Web.UI.WebControls.ImageButton ibtnlogin;
        protected System.Web.UI.WebControls.ImageButton ibtncancel;
        protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator1;
        protected System.Web.UI.WebControls.TextBox textpwd;
        protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator2;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            if (!IsPostBack)
            {
                this.textuser.Text="";
                this.textpwd.Text="";
            }// 在此处放置用户代码以初始化页面
        }
        #region Web 窗体设计器生成的代码
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: 该调用是 Web 窗体设计器所必需的。
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
    
        

        
        /// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {   
            this.ibtnlogin.Click += new System.Web.UI.ImageClickEventHandler(this.ImageButton1_Click);
            
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion
        
        private void ImageButton1_Click(object sender, System.Web.UI.ImageClickEventArgs e)
        {
                if (rbtnsupper.Checked)//如果超级管理员单选按钮选中
         {
                

             SqlConnection conn = new SqlConnection("server=.;uid=sa;pwd=;database=peisong");
             conn.Open();
                
             SqlCommand comm = new SqlCommand("select * from user where dlname='" + textuser.Text.ToString().Trim() + "'and pwd='" + textpwd.Text.ToString().Trim() + "' and powerid='1'", conn);
             SqlDataReader dr = comm.ExecuteReader();
             if (dr.Read())
             {
                 Response.Redirect("main.aspx");
                    
             }
             else
             {
                 Response.Write("<script>alert('用户名或者密码错误，登录失败！')</script>");
             }
             conn.Close();
         }
        
        }

        
    }
}