how to check that listbox's specific item have a value or not

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how to check that listbox's specific item have a value or not i am doing this two if conditions but both are use less how to do this

C#

if (!String.IsNullOrEmpty(lbTaxRate.GetItemText(lbTaxRate.Items[0]))&& !String.IsNullOrEmpty(lbTaxName.GetItemText(lbTaxName.Items[0])))
                {
                    objProduct.Tax1Name = lbTaxName.GetItemText(lbTaxName.Items[0]);
                    objProduct.Tax1Rate = Convert.ToDecimal(lbTaxRate.GetItemText(lbTaxRate.Items[0]));
                }

                if (!String.IsNullOrEmpty(lbTaxRate.GetItemText(lbTaxRate.Items[1])) && !String.IsNullOrEmpty(lbTaxName.GetItemText(lbTaxName.Items[1])))
                {
                    objProduct.Tax2Name = lbTaxName.GetItemText(lbTaxName.Items[1]);
                    objProduct.Tax2Rate = Convert.ToDecimal(lbTaxRate.GetItemText(lbTaxRate.Items[1]));
                }

as you can see above item[1]..item[0]...i am checking this is not a right approch so how i can i do this

Posted 23-May-14 3:53am

Muhamad Faizan Khan

Updated 4-Jun-14 22:29pm

v2

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-05-23T04:35:00

The question is is ill-posed: a list item, it it even exist, is some object. It does exist and, hence, always has a value. It depends on what do you mean by "value", because there are value types and reference types, but, from the point of your of the ListBox, this is an object of the type System.Object, which implies that the item reference something.

Again, it depends on what do you mean by "value". Apparently, you work with strings which you interpret as integers. Then you can consider empty string as "not a value", or, more generally, if decimal.TryParse(string, out decimal) returns false, you can consider this as "not a value". Please see: http://msdn.microsoft.com/en-us/library/9zbda557%28v=vs.110%29.aspx[^].

However, the whole approach is wrong.

You should not work with strings representing data instead of data itself. ListBox elements could be of any type, and you should use this fact by storing actual data in it. This is explained in detail in my past answer: combobox.selectedvalue shows {} in winform[^].

Don't use strings representing data where you need the data itself.

—SA

CPallini · Answer 2 · 2014-06-04T22:45:00

Solution 2

I would use arrays for both objProduct.TaxName and objProduct.TaxRate (or better a single array of a 'Tax' class instances). This way I wouldn't have to duplicate the code.

Posted 4-Jun-14 22:45pm

CPallini