I know css and html and using both to design my page with visual studio but not getting feeling of good design look and feel. Now if I want to design my page & want professional look & feel with not so much of stress which is the best best designing tool to use with ASP.NET. Thanks in Advance.
Use JavaScript in your project. It give you more graphic area. You can also Use WordPress Its good and useful for you.
The best 'tool' (IDE) to use with ASP.Net is Visual Studio, but that's like asking which is the best tool to use to gouge your eye out with. Using ASP.Net isn't the best way to create a site. IMO, it's about the worst way. Use HTML, CSS and Javascriptin the client and PHP on the server. Use Photoshop or GIMP for artwork, if you're using any.
DW really is the best option (IMO) if you want to develop a layout without doing the coding. Most layout designs start in Photoshop, and then are coded in DW. I usually use the code feature, but it has a pretty good WYSIWYG editor.