Adding values in ASP.NET C#

Question

1.00/5 (2 votes)

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hello, i wanted to do some calculation using lables,
in my page i am using values in the label which are being bought by checkboxes,
the values in label should be added and accrodingly directed to nect page,
its a personality test, so acc to the values, the page should be directed.

the values in the label are ranging from 0 nd 10 and 20.
according to the calculation, the grand total will be ranging from 0- 50, 50-100, 150-200, according to the codes.

its showing an error of

System.FormatException: 'Input string was not in a correct format.'

What I have tried:

private void total()
 {
     //double Balance;
     //double Amount1 = double.parse(this.Amount.text);
     //double Amount2 = double.parse(this.AmountPaid.text);
     //Balance = Amount1 - Amount2;

     //double value1, value2, value3, value4, value5, value6, value7, value8, value9, value10,total;


     //value1 = Convert.ToDouble(Label7.Text);
     //value2 = Convert.ToDouble(Label8.Text);
     //value3 = Convert.ToDouble(Label9.Text);
     //value4 = Convert.ToDouble(Label10.Text);
     //value5 = Convert.ToDouble(Label11.Text);
     //value6 = Convert.ToDouble(Label12.Text);
     //value7 = Convert.ToDouble(Label13.Text);
     //value8 = Convert.ToDouble(Label14.Text);
     //value9 = Convert.ToDouble(Label15.Text);
     //value10 = Convert.ToDouble(Label16.Text);

     int total = Convert.ToInt32(Label7.Text) + Convert.ToInt32(Label8.Text) + Convert.ToInt32(Label9.Text) + Convert.ToInt32(Label10.Text) + Convert.ToInt32(Label11.Text) + Convert.ToInt32(Label12.Text) + Convert.ToInt32(Label13.Text) + Convert.ToInt32(Label14.Text) + Convert.ToInt32(Label15.Text) + Convert.ToInt32(Label16.Text);


     if (total>50)
     {
         Response.Redirect("quizresult.aspx");
     }
     else if ((total >50) & (total>= 100))
     {
         Response.Redirect("quizresult1.aspx");
     }
     else if ((total > 100) & (total >= 150))
     {
         Response.Redirect("quizresult2.aspx");
     }
     else if ((total > 150) & (total >= 200))
     {
         Response.Redirect("quizresult3.aspx");
     }
 }

new this is from where labels values are shown

<td colspan="3" style="border-style: solid; border-width: thin">
               <asp:CheckBoxList ID="CheckBoxList1" runat="server" Height="41px" Width="480px" RepeatDirection="Horizontal">
                   <asp:ListItem>A-0</asp:ListItem>
                   <asp:ListItem>B-10</asp:ListItem>
                   <asp:ListItem>C-20</asp:ListItem>
               </asp:CheckBoxList>
               <br />
               <asp:Label ID="Label7" runat="server"></asp:Label>

protected void Button2_Click(object sender, EventArgs e)
        {

            Label7.Text = CheckBoxList1.SelectedItem.Text;
            Label8.Text = CheckBoxList2.SelectedItem.Text;
            Label9.Text = CheckBoxList3.SelectedItem.Text;
            Label10.Text = CheckBoxList4.SelectedItem.Text;
            Label11.Text = CheckBoxList5.SelectedItem.Text;
            Label12.Text = CheckBoxList6.SelectedItem.Text;
            Label13.Text = CheckBoxList7.SelectedItem.Text;
            Label14.Text = CheckBoxList8.SelectedItem.Text;
            Label15.Text = CheckBoxList9.SelectedItem.Text;
            Label16.Text = CheckBoxList10.SelectedItem.Text;

        }

Posted 17-May-22 23:24pm

Member 15198389

Updated 18-May-22 0:04am

v2

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Comments

Richard Deeming 18-May-22 5:35am

The values in your labels are not valid integers according to the parsing rules of the current culture.

Since we can't see your labels, and we have no access to your application, we can't tell you why.

You need to debug your code to find out what the label values are, and why they're not what you expect.

NB: Do yourself a favour and start giving your controls meaningful names, rather than accepting the default names suggested by Visual Studio. You might remember what value Label42 represents today, but when you come back to your code in six weeks, you'll have forgotten.

Member 15198389 18-May-22 5:37am

the values in label are just 0 10 and 20 and hey are bought in by checkboxes, can i show you my system?please can you help

Richard Deeming 18-May-22 5:59am

The error message you posted is:
Input string was not in a correct format

That means at least one of the values you are trying to parse is not a valid integer.

Once again, we cannot see your screen, access your computer, or read your mind. We have no way of knowing what the values in those labels are. All we know is that at least one of the values is not a valid integer.

YOU need to debug your code.

Member 15198389 18-May-22 5:40am

the values in the label are not inputed, they are sent from the checkbox, as i wnated the checkbox lists values to be straight away added and then sen tto the next page accrodingly, but didnt know how so i used label in between, i had used text box also before but it didnt come in the textbox the values from checkbox, so i used labels to get from checkbox

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Richard MacCutchan · Accepted Answer · 2022-05-17T23:39:00

Solution 1

Your if statements are all incorrect. In the first case if the total is equal to 120, then it is definitely greater than 50, so it will never go to any of the other tests. So it needs to be reordered to something like:

C#

if (total >= 200))
{
    Response.Redirect("quizresult3.aspx");
}
else if (total >= 150))
{
    Response.Redirect("quizresult2.aspx");
}
else if (total>= 100))
{
    Response.Redirect("quizresult1.aspx");
}
else if (total>50)
{
    Response.Redirect("quizresult.aspx");
}

But what happens if the total is 50 or less?

Also note: a single ampersand in your if statements is not correct, it should be

C#

if (expression1 && expression2)

Also using Convert.ToInt32 on all those text fields will crash your code if any of them contains a non-numeric character. And are you sure you want the values from labels rather than input fields?

Posted 17-May-22 23:39pm

Richard MacCutchan

Comments

Member 15198389 18-May-22 5:44am

can i please give you my anydesk code and can you check?please

Richard MacCutchan 18-May-22 5:51am

If you have further information then use the Improve question link above, and add the details to your question.

Member 15198389 18-May-22 5:55am

i have no much details, i dont know how to express more, so like i chnaged the if statements now how do i chnage the int double , or how do i add the values? like i am using label and those are int values only, how do i brig the label values and add them?

Richard MacCutchan 18-May-22 5:59am

You should use Int.TryParse on each value, so you can capture any item that is not a valid number. And since we cannot see exactly what you have in these labels we cannot guess what may be wrong.

Member 15198389 18-May-22 6:05am

i have improved question and shwoed, given just one checkbox lits but others alos the same only

Richard Deeming 18-May-22 6:11am

None of the list items you've shown contain a valid integer in their text.

What precisely do you think the result of Convert.ToInt32("A-0") will be?

Richard MacCutchan 18-May-22 6:17am

Interesting conundrum. :)

Member 15198389 18-May-22 6:25am

conundrum?

Member 15198389 18-May-22 6:07am

omg now i understood my mistake.\, let me try after removing a b c

Member 15198389 18-May-22 6:27am

working now, thank you so much, but like can you suggest an idea from where i can select the value from the checkbox and straight it analyzes the if staements and goes to the nxt page?

Richard MacCutchan 18-May-22 9:34am

That is not easy without seeing the entire code that you are using. Maybe you need to rethink why you need all these selectors just to calculate a total value.