Your have a couple of problems.
First One:
Get rid of the funky quotes that you are using. You are using the ASCII & #148; character and ASP is looking for the & #34; ASCII character.
Change this: ”
To this: "
Second One:
Code:
Mail.Body=”Hey! I am sending this email through an ASP Page and
guess what? I haven’t learnt much yet, but know that ASP is very
powerful.”
Will throw an error due to the fact that it wraps to more than 1 line.
Try this code instead and note that the only difference is the use of the proper quotes character and the fact that I am concatenating the lines of your Mail.Body. In addition be SURE to use a valid FROM address that is valid for the account or you will wait all day for that email that will never come 
Code:
<%
Set Mail=Server.CreateObject("CDONTS.NewMail")
Mail.To="alexming@wilcointernet.net"
Mail.From="alexming@wilcointernet.net"
Mail.Subject="Just testing my script"
Mail.Body="Hey! I am sending this email through an ASP Page " & _
"and guess what? I haven’t learnt much yet, but know that ASP is very powerful."
Mail.Send
Set Mail=nothing
%>
HTH
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