Veriyi Session'dan tutma ve session daki veri okuma

protected void Page_Load(object sender, EventArgs e)
{
     SqlDataAdapter adp = new SqlDataAdapter("SELECT * FROM Tbl_Makina", Con);
     DataTable dt = new DataTable();
     adp.Fill(dt);
     Session.Add("dt", dt);
     adp.Dispose();
}

protected void BtnOku_Click(object sender, EventArgs e)
{
     DataTable dt = new DataTable();
     dt = (DataTable)Session["dt"];
     Response.Write(dt.Rows[0]["OrderID"].ToString());
     DataList1.DataSource = dt;
     DataList1.DataBind();
     dt.Dispose();
     dt.Clear();
     Session["dt"] = null;
}