calculation in boolean

Question

I have a drop down list where I stored 3 elements inside it.

<asp:DropDownList ID="DropDownList4" runat="server" AutoPostBack="True" 
                Height="22px" Width="134px">
                <asp:ListItem>Please Choose</asp:ListItem>
                <asp:ListItem>Yes</asp:ListItem>
                <asp:ListItem>No</asp:ListItem>
            </asp:DropDownList>

When user choose Yes in drop down, the YES will be stored in session. Chauffeur service will charge user $30.

    Session["IsChauffeurUsed"] = DropDownList4.SelectedItem.Selected;

The thing is what to do if user select YES the the current amount that user have to pay is

    int totalValue = 0;
    int total = 0;
    totalValue = int.Parse(Session["price"].ToString()) * int.Parse(Session["day"].ToString()); 
    Label8.Text = totalValue.ToString();

*Label8.text will be plus 30 (if user select yes)

I got stuck at the bold line. I dont know how to add 30 in totalValue if user select YES I hope u guys can help me. Cheers.

If `Session["IsChauffeurUsed"]` equals "Y", add 30 to total value, now where are you stuck at ? — V4Vendetta, Aug 02 '12 at 07:09
I believe that this question has already been asked before. http://stackoverflow.com/questions/11754489/calculation-in-code-behind/11754647#11754647 — Umesh, Aug 02 '12 at 07:12
@Umesh, yeap, but i didnt get the answer yet. So, i re-post it so that new comers will look at my prob. Thanks for your concern. :) — Stuck, Aug 02 '12 at 07:14
@Stuck, I guess you got the answer in that post itself by Vinoth. — Umesh, Aug 02 '12 at 07:18

score 2 · Answer 1 · answered Aug 02 '12 at 07:14

2

You have to check you session value (If needed Add check for null) and then conditionally add the value

If (Session["IsChauffeurUsed"].ToString() == "Yes")
      totalValue +=30 ;
Label8.Text = totalValue.ToString();

answered Aug 02 '12 at 07:14

V4Vendetta

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score 1 · Accepted Answer · answered Aug 02 '12 at 07:16

1

Despite the fact that i find it horrible to take something, call ToString() on it and afterwards Type.Parse() on this string you could solve the problem as follows:

totalValue = int.Parse(Session["price"].ToString()) * int.Parse(Session["day"].ToString()); 
totalValue += Session["IsChauffeurUsed"].ToString().Equals("yes", StringComparer.CurrentCultureIgnoreCase) ? 30 : 0;

answered Aug 02 '12 at 07:16

Oliver

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Hi @Oliver, I get this error when applying your code. Member 'object.Equals(object, object)' cannot be accessed with an instance reference; qualify it with a type name instead – Stuck Aug 02 '12 at 07:20
@Stuck: Must be something with your `Session` or sth else. This dummy doesn't throw any errors: `int test = "test".ToString().Equals("yes", StringComparison.CurrentCultureIgnoreCase) ? 30 : 0;` – Oliver Aug 02 '12 at 07:26

calculation in boolean

2 Answers2