asp.net登陆前台后台源代码

前台代码：

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        body {font:12px Helvetica, Arial, sans-serif;  margin:100px auto; padding:0; word-wrap:break-word; word-break:break-all; background-color:#016BA9;}
        .login1{background-p_w_picpath: url(../Images/login_1.jpg); width:960px; height:94px; margin:0 auto;}
        .login2{background-p_w_picpath: url(../Images/login_2.jpg); width:960px; height:49px; margin:0 auto; }
        .login3{background-p_w_picpath: url(../Images/login_3.jpg); width:960px; height:125px; margin:0 auto;}
        .login4{background-p_w_picpath: url(../Images/login_4.jpg); width:960px; height:91px; margin:0 auto;}
        .loginTXT{border: 1px solid #800000; width:150px; background-color:#866961; color:#fff; height:19px;}


          if (top.location != self.location)
              top.location = self.location;

          function CheckIn() {
              var names = document.getElementById("txtU_Name").value;
              var pass = document.getElementById("txtU_Pass").value;
              var check = document.getElementById("txtU_Check").value;
              if (names == "") {
                  alert("请输入用户名...");
                  document.getElementById("txtU_Name").focus();
                  return false;
              }
              else if (pass == "") {
                  alert("请输入用户密码...");
                  document.getElementById("txtU_Pass").focus();
                  return false;
              }
              else if (check == "") {
                  alert("请输入验证码...");
                  document.getElementById("txtU_Check").focus();
                  return false;
              }
          }

        用户名称：



        用户密码：



        验证代码：









                              onclick="BtnHome_Click" />

protected void BtnLogin_Click(object sender, EventArgs e)
    {
        string username = txtU_Name.Text;
        string pwd = txtU_Pass.Value;
        string check = txtU_Check.Text;

        if (CheckNull())
        {
            if (check.ToString().ToLower() == Session["ValidateCode"].ToString().ToLower())
            {
                string strsql = "select count(1) from Login where UserName='" + username + "' and UserPwd='" + pwd + "'";
                object obj = SqlHelper.ExecuteScalar(ConfigurationManager.ConnectionStrings["conn"].ToString(), CommandType.Text, strsql);
                if (obj != null && (int)obj > 0)
                {
                    Response.Write("");
                    Session["username"] = username;

                    HttpCookie hc = new HttpCookie("username", username);
                    hc.Expires = DateTime.Now.AddMinutes(1);
                    Response.Cookies.Add(hc);

                    Response.Redirect("Main.aspx");
                }
                else
                {
                    Response.Write("");
                    Response.Write("");
                }
            }
            else
            {
                Response.Write("");
                Response.Write("");

            }
        }

    }
    private bool CheckNull()
    {
        return (!(string.IsNullOrEmpty(txtU_Name.Text.Trim())) && !(string.IsNullOrEmpty(txtU_Pass.Value.Trim())) && !(string.IsNullOrEmpty(txtU_Check.Text.Trim()))) ? true : false;
    }

try
        {
            string username = Session["username"].ToString();
        }
        catch
        {
            Response.Write("");
        }

asp.net登陆前台后台源代码

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