Admin/Adminlogin.aspx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

public partial class Admin_Adminlogin : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
         
        }
    }
    protected void btnLogin_Click(object sender, EventArgs e)
    {
        if (txtUserName.Text.Trim() == "")
        {

            Common.Show(this, "请输入用户名", "");
            return;
        }

        if (txtPassword.Text.Trim() == "")
        {
            Common.Show(this, "请输入密码", "");
            return;
        }
        if (code1.Value == "")
        {
            Common.Show(this, "验证码不能为空", "");
            return;
        }
        if (Session["checkcode1"] == null)
        {
            Response.Redirect("AdminLogin.aspx");
            Common.Show(this, "请刷新页面！", "");
            return;
        }
        else if (code1.Value != Session["checkcode1"].ToString())
        {
            Common.Show(this, "输入的验证码有误", "");
            return;
        }

        string sql = "select * from admin";
        DataTable dt = new DataTable();
        dt = DbHelperSQL.Query(sql).Tables[0];
        System.Data.DataView dView = dt.DefaultView;
        dView.RowFilter = "loginName='" + txtUserName.Text.Trim().Replace("'", "") + "'";
        DataTable tab = dView.ToTable();
        if (tab.Rows.Count == 0)
        {
            Common.Show(this, "系统中没有当前输入的登陆名,请重新输入!", "");
            return;
        }