Can we convert a N-tier application in to MVC Architecture,
If you understand the change asked, it would be simple to say it cannot be converted automatically using a tool or so as they are two separate architecture and design. You have to start from scratch and re-design your whole application.
if not please suggest any other ways.
What other way? Create a new project and implement MVC architecture. You can also use MVC for it.
These would help:
Microsoft: Learn ASP.NET MVC[
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Sample MVC ASP.NET Application[
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Make your first ASP.NET MVC Web Application [
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Videos: ASP.NET MVC 3[
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To know about MVC and how does it helps/fit in ASP.NET, read
this[
^].
For MVC pattern, then have a look at
this[
^].