how to perform multiplication of a labels value from dropdown value and then put it back in to dt label

Question

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C#

var price = from st in obj.movie_details
                    where st.Id == name
                    select st.price;
        int? myPrice = price.FirstOrDefault();
        Int32 pricein = myPrice.HasValue ? myPrice.Value : 0;
        Label2.Text = pricein.ToString();

this is the query and the value is in label2
and here is a dropdown

ASP.NET

<asp:DropDownList ID="DropDownList1" runat="server" 
                onselectedindexchanged="DropDownList1_SelectedIndexChanged">
                <asp:ListItem>1
                <asp:ListItem>2
                <asp:ListItem>3
                <asp:ListItem>4
                <asp:ListItem>5
                <asp:ListItem>6

now i want that as i m select the value of dropdown that should be multiply by the label2s value and now put this value again in label2

Posted 9-Sep-13 20:46pm

Omprakash Kukana

Updated 9-Sep-13 20:48pm

TheUltimateDebugger

v3

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phil.o · Accepted Answer · 2013-09-09T20:57:00

This way:

C#

private void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
   int factor = DropDownList1.SelectedIndex + 1;
   int pricein = int.Parse(Label2.Text);
   int totalPrice = pricein * factor;
   Label2.Text = totalPrice.ToString();
}

BUT: if you change the selection in the DropDownList several times, the value in your Label will increase each time.
You should rely not on the value displayed by the label, but on an integer variable stored in your class that you can access from the EventHandler.

C#

private void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
   int factor = DropDownList1.SelectedIndex + 1;
   int totalPrice = pricein * factor; // Here pricein has to be declared outside the method and must hold the unbiased price value
   Label2.Text = totalPrice.ToString();
}

Hope this helps.