App_Code/MyString.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.Text;
//该源码下载自www.51aspx.com(５１ａｓｐｘ．ｃｏｍ)

/// <summary>
/// MyString 的摘要说明
/// </summary>
public class MyString
{
    #region 去除非法字串
    /// <summary>
    /// 去除非法字串
    /// </summary>
    /// <param name="InPut">原字串</param>
    /// <returns>过滤过的字串</returns>
    public static string ReplaceBadChar(string InPut)
    {
        if (InPut.Trim() == "")
        {
            return "";
        }
        else
        {
            StringBuilder OutPut = new StringBuilder();
            OutPut.Append(InPut);
            OutPut.Replace("'", "");
            OutPut.Replace("*", "");
            OutPut.Replace("?", "");
            OutPut.Replace("(", "");
            OutPut.Replace(")", "");
            OutPut.Replace("<", "");
            OutPut.Replace("=", "");

            return OutPut.ToString().Trim();
        }
    }
    #endregion
}