Web/Admin/Admin.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class Web_Admin_Admin : System.Web.UI.Page
{
    Dbhelp dh = new Dbhelp();
    protected void Page_Load(object sender, EventArgs e)
    {       
        TxtName.Focus();
        if(!IsPostBack)
        ChekCode();
    }
    #region 生成验证码
    protected void ChekCode()
    {
        Random rd = new Random();
       LblCheckCode.Text=rd.Next(10000,19999).ToString();
    }

    #endregion
    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
        if (Convert.ToInt32(TxtChekCode.Text.Trim()) == Convert.ToInt32(LblCheckCode.Text.Trim()))
        {
            Session["UserPower"] = null;
            string sql = "select count(*) from Administrator where Name=@name and Pwd=@pwd";
            SqlCommand cmd = new SqlCommand(sql, dh.conn);
            if (dh.conn.State == ConnectionState.Closed)
                dh.conn.Open();
            SqlParameter name = new SqlParameter("@name", TxtName.Text);
            SqlParameter pwd = new SqlParameter("@pwd", TxtPwd.Text);
            cmd.Parameters.Add(name);
            cmd.Parameters.Add(pwd);
            int count = (int)cmd.ExecuteScalar();
            if (count > 0)
            {
                Session["UserPower"] = TxtName.Text;
                Response.Redirect("Admin_1.aspx");
            }
            else
            {
                dh.MessageShowBox("您的用户名与密码有误，登录失败！");
            }
        }
        else
        {
            dh.MessageShowBox("验证码有误！");
        }
    }
}