App_Code/Dbhelp.cs

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using System;
using System.Data;
using System.Configuration;
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;
using System.Text;
using System.Text.RegularExpressions;
/// <summary>
/// Dbhelp 的摘要说明
/// </summary>
public class Dbhelp
{
   protected static string con = ConfigurationManager.ConnectionStrings["connstr"].ToString();
    public SqlConnection conn = new SqlConnection(con);
    //public SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=Studentdatabase;uid=sa;pwd=123456;");
    #region 用户登录验证
    /// <summary>
    /// 验证用户是否是合法用户
    /// </summary>
    /// <param name="sql">接受SQL语句</param>
    /// <returns></returns>
    public int CheckLogin(string sql)
    {
        try
        {
            SqlCommand cmd = new SqlCommand(sql, conn);
            if (conn.State == ConnectionState.Closed)
            {
                conn.Open();
            }
            int result = (int)cmd.ExecuteScalar();
            return result;
        }
        catch (Exception ex)
        {
            HttpContext.Current.Response.Write(ex.Message);
            throw;
        }

    }
    #endregion
    #region 用户信息提示
    /// <summary>
    /// 对话框信息
    /// </summary>
    /// <param name="TxtMessage">接受要显示给用户的信息</param>
    public void MessageShowBox(string TxtMessage)
    {
        HttpContext.Current.Response.Write("<script language='javascript' type='text/javascript'>alert('" + TxtMessage + "')</script>");
    }
 
    #endregion
    #region 查询数据库信息
    /// <summary>
    /// 数据填充