How to remove hyper link line from url

Hai all,
I have an issue in my .net code
I have to send an email from my application.
I am using a sting builder to append the body message.
Where I append the following code
String username=test@test.com
String url=Request.Url.ToString()
When I sent the mail It will show a hyperlink in the url and the username.
What I want is to remove the hyperline from the email body.
How to fix this issue?
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