manipulate the filename before creating the saveFile


string newFile = FileUpload1.FileName;
newFile = "myfilename_" + newFile;
saveFile = Path.Combine(savePath, newFile);

For this you can use a query string or session, query string might be easiest.

connect.aspx.cs
protected void picUpload_Click(object sender, EventArgs e)
{
int year = 1870;...