I don't know a good title for my question, so I named it "how to declare functions and methods in ASP.NET" which has nothing to do with the body of the question.

string Filepath= Server.MapPath(@"~\");

HttpFileCollection uploadedFiles = Request.Files;

for (int i = 0; i < uploadedFiles.Count; i++)
{
HttpPostedFile userPostedFile = uploadedFiles[i];

try
{
if (userPostedFile.ContentLength > 0)
{
userPostedFile.SaveAs(Filepath + "\\" +System.IO.Path.GetFileName(userPostedFile.FileName));

}
}
catch (Exception Ex)
{
label1.Text += Ex.Message;
}
}

I have to write the above code in method..i have to call that method instead of writing all the code..