cs/liu.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.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Text;
using System.Web.Mail;
using System.Text.RegularExpressions;
using System.Data.OleDb;

/// <summary>
///公共方法
/// </summary>
public class liu
{
    private static HttpContext context = HttpContext.Current;

    /// <summary>
    /// 判断值sql字段是不是为空
    /// </summary>
    /// <param name="obj"></param>
    /// <returns></returns>

    public static object SqlNull(string obj)
    {
        if (obj == "")
            return DBNull.Value;

        return obj;
    }

    /// <summary>
    /// 截图字符长度
    /// </summary>
    /// <param name="o"></param>
    /// <param name="i"></param>
    /// <returns></returns>

    public static string zifu(Object o, int i)
    {
        if (o.ToString().Length > i)
        {
            return o.ToString().Substring(0, i) + "..";
        }
        else
        {
            return o.ToString();
        }
    }
    /// <summary>
    /// 判断一个字符串是不是数字
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    public static bool IsNumber(string input)
    {