前台登录验证

if (Session["verify"].ToString() == tbyanzhen.Text.ToUpper())
            {
                DataLinqDataContext ddc = new DataLinqDataContext();
                var mber = from m in ddc.member
                           where m.user_Name == tbuser.Text.Trim() && m.user_Isdel == 0
                           select m;
                if (mber.Count() > 0)
                {
                    member mb = ddc.member.Single(p => p.user_Name == tbuser.Text.Trim() && p.user_Isdel == 0);
                    if (mb.user_Password == Encrypts.Encrypt.DefaultMd5Encrypt(tbpassword.Text))
                    {
                        Session["UserName"] = tbuser.Text.ToUpper();
                        Session["Power"] = mb.user_Power;
                        //日志
                        LogManage.InsertLog("登录,IP:" + Request.UserHostAddress.ToString());
                        if (mb.user_Power.ToString() == "2")
                            Response.Redirect("FMS/account/zpgl.aspx");
                        else if (mb.user_Power.ToString() == "1" || mb.user_Power.ToString() == "0")
                            Response.Redirect("FMS/account/zpgl_admin.aspx");
                        else
                        {
                            FMS.Member.MemberManage.MsgShowBox(this, "你已被管理员禁用，请联系管理员");
                        }
                    }
                    else
                        ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "sucess", "alert('密码错误')", true);
                }
                else
                {
                    ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "false", "alert('用户名错误')", true);
                }
            }
            else
                FMS.Member.MemberManage.MsgShowBox(this, "验证码错误");