母页面：
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button3_Click(object sender, EventArgs e)
{
Server.Transfer("Default2.aspx");
}
public string aa()
{
string aaaaaa = "123123123";
return aaaaaa;
}
目标页面：
