HOW TO REDIRECT TO PAGE1 FROM PAGE2 AND PAGE3 DURING SEPARATE SESSIONS?

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C#

ASP

I have 3 pages: Available stock, Expired stock and Returned stock. From available stock i get selected rows from gridview and redirect to Returned stock. here extra parameters are updated . Similarly i wanna redirect from expired stock to returned stock with selected gridview rows. How to modify the below code?

public partial class Returnedstock : System.Web.UI.Page
    {
       

protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.IsPostBack)
            {

                if (Session["AvailableStock"] != null || Session["Expiredstock"] != null)
                {
                    BindGrid();
                }

            }
        }
 void BindGrid()
        {
            if (Session["AvailableStock"] != null)
            {
                DataTable dtselectedRows = Session["AvailableStock"] as DataTable;
                
                GridView1.DataSource = dtselectedRows;
                GridView1.DataBind();
            }
            else if (Session["Expiredstock"] != null)
            {
                DataTable dtselectedRows = Session["Expiredstock"] as DataTable;
                 GridView1.DataSource = dtselectedRows;
                GridView1.DataBind();
            }
            
        }