How to access label into another page

You can keep seperate labels in your aspx pages and use session to pass the label value between pages.
Lets say the ID of label in page 1 is "Label1" and ID of label in page 2 is "Label2"

In Page 1 you will store the value of label1 before redirecting to Page 2.

Session["LabelValue"] = Label1.text;

Response.Redirect("Page2.aspx");

In page 2 you can retrieve the value from session and assign it to label2 as shown below

if (Session["LabelValue"] != null)

{

    //get the Session value

    Label2.text = Session["LabelValue"].ToString();

}