Asp.net System.ArgumentOutOfRangeException Error with ListBox SelectedIndex

Asp.net System.ArgumentOutOfRangeException Error with ListBox SelectedIndex

By : user2951478
Date : November 18 2020, 11:13 AM
this one helps. The problem here is that you have two ListBoxes, one (tweetid) storing the id's (presumably a key of sorts) of the tweets, and the other (ListBox2) storing the text of the tweets. You also don't seem to be adding the dynamically created tweetid ListBox to the page anywhere (and presumably the intention is that the tweetid ListBox is hidden or similar).
You are then attempting to store synchronize the selected text drop down back to the original tweetid in the code behind Button click handler, based on the relative indexes of the data - it is apparant that the two listboxes are getting out of synch, plus, you aren't validating the user has selected a valid item, hence the ArgumentOutOfRange exception.
code :
<asp:ListBox runat="server" ID="TweetsListBox" DataTextField="Text" DataValueField="Id" EnableViewState="True" />
protected void Page_Load(object sender, EventArgs e)
    if (!IsPostBack)
        // Replace with your code to fetch tweets here
        TweetsListBox.DataSource = FetchSomeTweets();
        // We've alread set the names of the properties to use `Id` and `Text` in the aspx

protected void Button1_Click(object sender, EventArgs e)
    long tweetIdToRetweet;
    if (long.TryParse(TweetsListBox.SelectedValue, out tweetIdToRetweet))
        servis.Retweet(new RetweetOptions() { Id = tweetIdToRetweet });
        // Display Error that user must select a tweet
class Tweet
    public int Id { get; set; }
    public string Text { get; set; }

private static readonly IEnumerable<Tweet> SomeTweets = new[]
    new Tweet { Id = 123, Text = "This is tweet 123" },
    new Tweet { Id = 234, Text = "This is tweet 234" },
    new Tweet { Id = 345, Text = "This is tweet 345" }

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System.ArgumentOutOfRangeException Error

System.ArgumentOutOfRangeException Error

By : Elizabeth
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You have the exception thrown at Substring(0, 3) or Remove(0, 3) in case either str or clearStr is shorter than 3. I suggest adding validation:
code :
public static string ToCamelCase(string str) {
  // if str is null or too short 
  if (string.IsNullOrEmpty(str))
    return str;
  else if (str.Length < 3)
    return str;

  TextInfo myTI = new CultureInfo("en-US", false).TextInfo;
  string clearStr = Regex.Replace(myTI.ToTitleCase(str), @"_|-", "");

  // if clearStr is too short
  if (clearStr.Length < 3)
    return str;

  return clearStr = str.Substring(0, 3) + clearStr.Remove(0, 3);
System.ArgumentOutOfRangeException: InvalidArgument=Value of '0' is not valid for 'SelectedIndex'

System.ArgumentOutOfRangeException: InvalidArgument=Value of '0' is not valid for 'SelectedIndex'

By : Joel Fredd Sanchez
Date : March 29 2020, 07:55 AM
around this issue If this way I can list exist video capture devices: , before you add Device.Name, check if it exists in the first place
code :
if(Device!= null){
Check if listbox.SelectedIndex == listbox.Items.Count from BackgroundWorker

Check if listbox.SelectedIndex == listbox.Items.Count from BackgroundWorker

By : Wiggins
Date : March 29 2020, 07:55 AM
this one helps. This basically happens when you access the forms property from another thread, that's why this exception is thrown. Your UI operations must be performed on the owning thread.
You can do this:
code :
 int intIndex = 0;
 int intCount = 0;
        if (listBox1.InvokeRequired)
            listBox1.Invoke(new MethodInvoker(delegate { intIndex = listBox1.SelectedIndex ; }));

        if (listBox1.InvokeRequired)
            listBox1.Invoke(new MethodInvoker(delegate { intCount = listBox1.Items.Count; }));
        if (intIndex == intCount)
            // TODO: Business Logic
CheckForIllegalCrossThreadCalls = false;
How to debug a System.ArgumentOutOfRangeException error in C#?

How to debug a System.ArgumentOutOfRangeException error in C#?

By : TheMatto
Date : March 29 2020, 07:55 AM
This might help you This code is supposed to take two samples one original and one new, then determine the length of the smallest single consecutive piece that has been inserted into the first sequence. , The problem is:
code :
sample1 = sample1.Substring(i, sample1.Length);
Setting the SelectedIndex of a ComboBox throws ArgumentOutOfRangeException

Setting the SelectedIndex of a ComboBox throws ArgumentOutOfRangeException

By : user3824726
Date : March 29 2020, 07:55 AM
around this issue Aren't I quite the idiot. The selected index changed event was firing, and in that code a different combobox had it's selectedIndex set to 0 - however with certain data it wasn't being populated, and there was no basic error checking before setting the selectedIndex.
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