C#如何进行LDAP用户校验

示例代码如下：
private bool Authenticate(string userName, string password, string domain)
{
bool authentic = false;
try
{
DirectoryEntry entry = new DirectoryEntry(“LDAP://”+domain, userName, password);
object nativeObject = entry.NativeObject;
authentic = true;
}
catch (DirectoryServicesCOMException) { }
return authentic;
}