How to pass variables / infromation from one ASP page to another?

I have a page on my application where I use javascript for making several actions, and after that I would like to pass the result to a WebForm of my ASP.NET Web Application. The input variable I use in the first page is: and the string variable I have in the other WebForm is: string resultFromTheFirstPage = ?; I would like to pass the value of the input of the first page to the string variable of the WebForm. How can I refer that?? I had a look to some articles but I haven't found yet the solution, or my code doesn't work. What should I put in the

tag?? Which sentence(s) should I write in the WebForm to get the info?? Thanks, goraperas