How to print the webpages one after another in C#

Here is my complete code:

  private void LastSolution()
        {
            StringBuilder sb = new StringBuilder();


            List<PrintInfo> prints = ExcelData.GetDataFromExcel();
            foreach (var print in prints)
            {
                lblCertificate.Text = print.Certificate;
                lblAddress.Text = print.Address;
                lblBrand.Text = print.Brand;
                lblFrom.Text = print.FromDate;
                lblMobile.Text = print.Mobile;
                lblName.Text = print.Name;
                lblProduct.Text = print.Product;
                lblScheme.Text = print.Schema;
                lblSNo.Text = print.Sno;  
                lblTo.Text = print.ToDate;
                ///Write Print Code Here within Loop 
             ClientScript.RegisterClientScriptBlock(this.GetType(), "key","window.print()", true);





// Method body
        public static List<PrintInfo> GetDataFromExcel()
        {

            OleDbConnection oleconn = new OleDbConnection();
            OleDbCommand olecmd = new OleDbCommand();

            oleconn.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\Users\\ADMIN\\Desktop\\tryexcel.xlsx;Extended properties='Excel 12.0 Xml;HDR=YES;'";
            olecmd.CommandText = "select [c_firstname],[c_address],[c_mobilephone],[c_amctype],[c_fcrno],[c_product1],[c_band1],[c_slno1],[c_doa],[c_eoa] from [Sheet1$]";

            olecmd.Connection = oleconn;
            oleconn.Open();
            OleDbDataReader reader = olecmd.ExecuteReader();
            List<PrintInfo> prints = new List<PrintInfo>();
            PrintInfo print = null;
            while (reader.Read())
            {
                print = new PrintInfo();
                print.Certificate = reader.GetValue(4).ToString();
                print.Schema = reader.GetValue(3).ToString();
                print.Name = reader.GetValue(0).ToString();
                print.Address = reader.GetValue(1).ToString();
                print.Mobile = reader.GetValue(2).ToString();
                print.Product = reader.GetValue(5).ToString();
                print.Brand = reader.GetValue(6).ToString();
                print.Sno = reader.GetValue(7).ToString();
                print.FromDate = reader.GetValue(8).ToString();
                print.ToDate = reader.GetValue(9).ToString();

                prints.Add(print);
            }

            return prints;
        }
    

// Calling method here

private void LastSolution()
        {
            StringBuilder sb = new StringBuilder();


            List<PrintInfo> prints = ExcelData.GetDataFromExcel();
            foreach (var print in prints)
            {
                lblCertificate.Text = print.Certificate;
                lblAddress.Text = print.Address;
                lblBrand.Text = print.Brand;
                lblFrom.Text = print.FromDate;
                lblMobile.Text = print.Mobile;
                lblName.Text = print.Name;
                lblProduct.Text = print.Product;
                lblScheme.Text = print.Schema;
                lblSNo.Text = print.Sno;  
                lblTo.Text = print.ToDate;
                ///Write Print Code Here within Loop 
             ClientScript.RegisterClientScriptBlock(this.GetType(), "key","window.print()", true);