Prodev

I have list of web based projects using c#.They are aleady executed.They want me execute that projects now.Iam not able to execute some of those projects. Can any body help me in telling the method to execute those projects.
Some of project folder does not have solution file.

it sees that you are talking about ASP.NET. you have some ways to run them.

1- Visual Studio Development Server:
if you are using visual studio open .ASPX files in visual studion and press F5. if in the folder you mentioned exists a file with this name: default.aspx it is mostly the main entry of the web project so open it in Visual Studio and Press F5

2- IIS:
if you don't have visual studion go to this folder C:\Inetpub\wwwroot
(i assume that it is installed in root c; if it is not installed on your pc go to control panel and instal IIS) and copy your projects to then in your browser (e.g. IE) type some url like this:
http://localhost/default.aspx (i assumed the page you want to see is default.aspx)
if your using windows 2003 server by default ASP pages is off goto to administration panel and turn it on (be sure that IIS is installed).