Question

i have this code:

ArrayList list = new ArrayList();
foreach (DataRow dataR in prenume.Rows)
{
    foreach (var item in dataR.ItemArray)
    {
        if (item.Equals("  ")) continue;
        list.Add(item);
        if (input_string.Equals(item.ToString()) && list.Count > 0 )
        {
            label_hello.Text = "Hello, " + list[2];
        }
    }
}

When i’m trying to clear the text showed , i get an error which says:

Index was out of range. Must be non-negative and less than the size
of the collection.

Later edit:

        Solution found!I was too tired ... sorry for the question!

Answer 1

Well, you start off with an empty list, and then after adding a single item, you might execute (if input_string equals the first item in the first item array):

label_hello.Text = "Hello, " + list[2];

That’s trying to access the third item in the list. It will fail when there’s only one item. Why did you pick 2 here?

(As an aside, why are you using ArrayList? The generic List<T> type is preferred.)

It’s not clear what you’re trying to achieve – if you can give us more context, we have a better chance of helping you.

EDIT: From the comments, it looks like this should be

label_hello.Text = "Hello, " + dataR[2];

However, I suspect the loops are still not right… why would you want to iterate over every value in the table, rather than (say) in just one column?