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") = -1) And (strEmail.IndexOf("gmail") = -1) And (strEmail.IndexOf("yahoo") = -1) 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") > -1) Or (strEmail.IndexOf("yahoo") > -1) Or (strEmail.IndexOf("gmail") > -1))
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