Question

Input string was not in a correct format. At this line:

int total = 0;
total = int.Parse(TextBox2.Text) + int.Parse(TextBox4.Text) + int.Parse(TextBox6.Text) + 
        int.Parse(TextBox8.Text) + int.Parse(TextBox10.Text) + int.Parse(TextBox12.Text) + 
        int.Parse(TextBox14.Text) + int.Parse(TextBox16.Text);
Label1.Text = total.ToString(); 

I would like to pass the value to another page.
what does it means? T_T
Thanks in advance 🙂

protected void Button1_Click(object sender, EventArgs e)
{
    Session["Month"] = DropDownList2.SelectedValue;
    Session["expen1"] = TextBox1.Text;
    Session["expen2"] = TextBox3.Text;
    Session["expen3"] = TextBox5.Text;
    Session["expen4"] = TextBox7.Text;
    Session["expen5"] = TextBox9.Text;
    Session["expen6"] = TextBox11.Text;
    Session["expen7"] = TextBox13.Text;
    Session["expen8"] = TextBox15.Text;

    int totalvalue = 0;
    totalvalue = int.Parse(TextBox2.Text) + int.Parse(TextBox4.Text) + int.Parse(TextBox6.Text) + int.Parse(TextBox8.Text) + int.Parse(TextBox10.Text) + int.Parse(TextBox12.Text) + int.Parse(TextBox14.Text) + int.Parse(TextBox16.Text);
    Label1.Text = totalvalue.ToString(); 

    Session["price1"] = TextBox2.Text;
    Session["price2"] = TextBox4.Text;
    Session["price3"] = TextBox6.Text;
    Session["price4"] = TextBox8.Text;
    Session["price5"] = TextBox10.Text;
    Session["price6"] = TextBox12.Text;
    Session["price7"] = TextBox14.Text;
    Session["price8"] = TextBox16.Text;
    Session["total"] = Label1.Text;

    Server.Transfer("sum.aspx");


}

I want to store the result in sum.aspx.

Answer 1

If any of your TextBox values are null or are not a number, this will break. In order for this to work, all of the TextBox values will need to have a default value of 0 and you will have to restrict the input of the TextBox to numbers.