Question

I have the following code in my program which is throwing index out of bound exception at
line yearList.SetValue(years[count], count);

protected void invoiceYear_DataBound(object sender, EventArgs e)
        {
           //invoiceYear.SelectedItem.Value= GetYearRange();
            String[] years = GetYearRange().Split(new char[] { '[', ',', ']',' ' });
            ListItem [] yearList = new ListItem[]{};
            System.Diagnostics.Debug.WriteLine("years-->" + years.Length);
            for (int i = 0; i < years.Length; i++)
            {
                System.Diagnostics.Debug.WriteLine("years-->" + years.GetValue(i));

            }
            int count = 0;
            foreach (String str in years)
            {
                if (string.IsNullOrEmpty(str))
                    System.Diagnostics.Debug.WriteLine("empty");
                else
                {
                    yearList.SetValue(years[count], count);
                    count++;
                }
            }

            //System.Diagnostics.Debug.WriteLine("yearList-->" + yearList.GetValue(0));
            //invoiceYear.Items.AddRange(yearList);
        }

Answer 1

You haven’t asked a question, so I’m going to guess your question is simply “Why?”

yearList is defined as an empty array:

ListItem [] yearList = new ListItem[]{};

It’s length is always zero. Therefore you cannot set any elements of it, as it has no elements to set.

UPDATE

You’ve now asked: “But I am not getting how to declare a dynamic array??”

There are no dynamic arrays in .NET. You have a number of different collection types depending on your scenario. I’ll suggest that List<ListItem> is probably what you want.

List<ListItem> yearList = new List<ListItem>(); // An empty list

Then

yearList.Add(years[count]); // Adds an element to the end of the list.

Alternatively, that whole loop could be better written as:

        foreach (String str in years)
        {
            if (string.IsNullOrEmpty(str))
                System.Diagnostics.Debug.WriteLine("empty");
            else
            {
                yearList.Add(str);
            }
        }

Then you are not having to worry about the count and nor are you getting out of step (because you are only incrementing count when str contains something – which is probably not what you want)

UPDATE 2
And if you desperately do need an array at the end, you can always covert the list to an array using yearList.ToArray(), but remember to add using System.Linq; at the top of your file as it is an extension method that LINQ provides and not part of the List class itself.