How to create an X509-certificate with C# / .NET

Question

Hi, i want to write a small programm, which generates x509-certificates forme. I know, makecert.exe can do that for me. But I want it more comfortable, with a GUI. I wrote something like that in Java, but I´d like to have it in C#, with access to Windows´ certificate db. Hopefully somebody here can helb me. Thanks so far, Cheers Philipp