How to upload a file (anyfile) to projectfile i.e solutionexplorer in ASP.Net

Solution explorer folder is a fictional structure used just for convenience of working with project using Visual Studio IDE; it is not reflected at the directory structure of the solution. Now, about a solution: it does not really exist in the Web server file structure in the deployed project. When you upload files via Web, the uploaded files have nothing to do with the "solution". The question makes no sense.

May be you mean something else, just uploading files? Re-formulate the question then.

—SA

Then where do you want to upload else solution explorer.
Solution explorer contains all files,folders,pages,images, classes which are used in project in asp.net.