Google Chrome page loaded two times

Question

why Google chrome is page loaded two times but other browsers working fine in asp.net?

 

 

protected void AddProductToSession(object sender, EventArgs e)

{

Bill product1 = new Bill(Productname.Text, int.Parse(ProductID.Text), int.Parse(quantityProduct.Text), int.Parse(UnitPrice.Text), int.Parse(TotalPrice.Text));

InvoiceModel invoiceNew = null;

invoiceNew = (InvoiceModel)Session["InvoiceModel"];

//invoiceNew = invoicemodel;

invoiceNew.bill.Add(product1);

ProductTableInvoice.Visible = true;

String txt = "";

txt += "<table class=\"table table-striped table-hover table-bordered\" id=\"ItemtableProduct\" >"

+ "<thead><tr><th>#</th><th>Product Name</th><th>Quantity</th><th>Unit Price</th><th>Total Price</th><th>Control</th>"

+ "</tr></thead><tbody>";

for (int i = 0; i < invoiceNew.bill.Count; i++)

{

txt += "<tr><td>" + (i + 1) + "</td><td>" + invoiceNew.bill[i].Productname + "</td>"

+ "<td>" + invoiceNew.bill[i].quantity + "</td><td>" + invoiceNew.bill[i].Unitprice + "</td>"

+ "<td>" + invoiceNew.bill[i].totalAmount + "</td><td>"

+ "<a class=\"delete\" href=\"javascript:;\">Delete</a></td></tr>";

}

txt += "</tbody></table>";

ProductTableInvoice.InnerHtml = txt;

Session["InvoiceModel"] = invoiceNew;

//invoicemodel = invoiceNew;

SubmitButtonDiv.Visible = true;

}