verify a certificate

From: Frank (lgd94047271@msn.cn)
Date: 03/24/03 

From: "Frank" <lgd94047271@msn.cn>
Date: Sun, 23 Mar 2003 18:38:27 -0800

If a customer send his certificate to me (with his public
key),
how can I verify that it is the right certificate, if the
certificate was changed by others by using the root
certificate installed in my system.I mean I have the root
certificate that used the to creat his custom certificate.
How can I do it in C#?
                                        Thank you!!!

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