写的一个判断注册Email是否是个人邮件，而不是公司邮件的方法

以下这个方法其实也不是很全面，它只判断了hotmail, gmail和yahoo

如果你还需要加上其他认为是私人Email的Email, 只要按照同样的方法自己加上就可以了

    Public void CheckPersonalEmail(ByVal sender As Object, ByVal email As ServerValidateEventArgs)
    {
            string strEmail = email.Value.ToLower;

            var r = New Regex("([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$", RegexOptions.IgnoreCase);

            if((strEmail <> "") And (strEmail.IndexOf("hotmail") = -) And (strEmail.IndexOf("gmail") = -) And (strEmail.IndexOf("yahoo") = -) And (r.Match(strEmail).Success))
             email.IsValid = true

            if  (!email.IsValid)
            {
                If (strEmail = "")
                      CustomValidator1.ErrorMessage = "<br />Please enter an email address"

                If ((strEmail.IndexOf("hotmail") > -) Or (strEmail.IndexOf("yahoo") > -) Or (strEmail.IndexOf("gmail") > -))
                    CustomValidator1.ErrorMessage = "<br />You cannot use a personal email address"

                If  (!r.Match(strEmail).Success)
                     CustomValidator1.ErrorMessage = "<br />You must enter a valid email address"
            }

     }
    

基于vb.net我自己改写的，可能有的地方语法不正确，自己在Visual Studio中更改就好