//验证用户输入的字符串中时候只含有数字或字母,汉字
  bool IsValidString(string strIn)
  {
return Regex.IsMatch(strIn,@"^[A-Za-z0-9\u4e00-\u9fa5]+$");
  }
//验证电子邮件
  bool IsValidEmail(string strIn)
  {
return

Regex.IsMatch(strIn,@"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
  }
//验证用户输入的字符串中时候只含有数字或字母
  bool IsValidString(string strIn)
  {
return Regex.IsMatch(strIn,@"^[A-Za-z0-9]+$");
  }
/// <summary>
/// 判断密码
/// </summary>
/// <param name="PassWord"></param>
/// <returns></returns>
  public static bool IsValidPassWord(string PassWord)
  {
return Regex.IsMatch(PassWord, @"^(\w){6,20}$");
  }

/// <summary>
/// 判断电话/传真
/// </summary>
/// <param name="Tel"></param>
/// <returns></returns>
  public static bool IsValidTel(string Tel)
  {
return Regex.IsMatch(Tel, @"^[+]{0,1}(\d){1,3}[ ]?([-]?((\d)|[ ]){1,12})+$");
  }

/// <summary>
/// 判断手机
/// </summary>
/// <param name="Mobil"></param>
/// <returns></returns>
  public static bool IsValidMobil(string Mobil)
  {
return Regex.IsMatch(Mobil, @"^(\d)+[-]?(\d){6,12}$");
  }

/// <summary>
/// 邮政编码
/// </summary>
/// <param name="Zip"></param>
/// <returns></returns>
  public static bool IsValidZip(string Zip)
  {
return Regex.IsMatch(Zip, @"^[a-z0-9 ]{3,12}$");
  }

/// <summary>
/// 判断日期
/// </summary>
/// <param name="Date"></param>
/// <returns></returns>
  public static bool IsValidDate(string Date)
  {
bool bValid=Regex.IsMatch(Date, @"^[12]{1}(\d){3}[-][01]?(\d){1}[-][0123]?(\d){1}$");
return (bValid && Date.CompareTo("1753-01-01")>=0);

  }

//判断整型
  /*public static bool IsValidInt(string Int)
  {
   return Regex.IsMatch(Int, @"^[1-9]{1}[0-9]{0,6}$");
  }*/

/// <summary>
/// 判断只能输字母
/// </summary>
/// <param name="EnName"></param>
/// <returns></returns>
  public static bool IsValidEnName(string EnName)
  {
return Regex.IsMatch(EnName, @"[a-zA-Z]");
  }

//去除输入的字符串中不合法的<>\"'%;()&
  private string SanitizeInput(string input)
  {
   Regex badCharReplace = new Regex(@"^([<>""'%;()&])$");
string goodChars = badCharReplace.Replace(input, "");
return goodChars;
  }

//用正则表达式过滤脚本
public string wipeScript(string html)
{
System.Text.RegularExpressions.Regex regex1 = new

System.Text.RegularExpressions.Regex(@"<script[\s\S]+</script

*>",System.Text.RegularExpressions.RegexOptions.IgnoreCase);
System.Text.RegularExpressions.Regex regex2 = new

System.Text.RegularExpressions.Regex(@" href *= *[\s\S]*script

*:",System.Text.RegularExpressions.RegexOptions.IgnoreCase);
System.Text.RegularExpressions.Regex regex3 = new

System.Text.RegularExpressions.Regex(@"

on[\s\S]*=",System.Text.RegularExpressions.RegexOptions.IgnoreCase);
System.Text.RegularExpressions.Regex regex4 = new

System.Text.RegularExpressions.Regex(@"<iframe[\s\S]+</iframe

*>",System.Text.RegularExpressions.RegexOptions.IgnoreCase);
System.Text.RegularExpressions.Regex regex5 = new

System.Text.RegularExpressions.Regex(@"<frameset[\s\S]+</frameset

*>",System.Text.RegularExpressions.RegexOptions.IgnoreCase);
html = regex1.Replace(html, ""); //过滤<script></script>标记
html = regex2.Replace(html, ""); //过滤href=javascript: (<A>) 属性
html = regex3.Replace(html, " _disibledevent="); //过滤其它控件的on...事件
html = regex4.Replace(html, ""); //过滤iframe
html = regex5.Replace(html, ""); //过滤frameset
return html;
}

//对输入的字符串是否含有<script></script>判断
public bool IsValidScript(string html)
{
return Regex.IsMatch(html,@"<script[\s\S]+</script *>");
}

//对输入的字符串是否含有href=javascript: (<A>)字符判断
public bool IsValidJavascript(string html)
{
return Regex.IsMatch(html,@" href *= *[\s\S]*script *:");
}

//对输入的字符串是否含有on...事件判断
public bool IsValidOn(string html)
{
return Regex.IsMatch(html,@" on[\s\S]*=");
}

//对输入的字符串是否含有iframe判断
public bool IsValidiframe(string html)
{
return Regex.IsMatch(html,@"<iframe[\s\S]+</iframe *>");
}

//对输入的字符是否含有frameset判断
public bool IsValidFrameset(string html)
{
return Regex.IsMatch(html,@"<frameset[\s\S]+</frameset *>");
} 似乎.net对这些有自己的判断