How to add objects to a RadioButtonList based on random order ?

Question

I am creating a radio button list in the back end of the system. Is there any method that let me display items with random order ?

My Code :

<asp:radiobuttonlist id="RadioButtonList1" runat="server" 
                                TextAlign="Right" CellPadding="10" RepeatLayout="Table" 
                                CausesValidation="True" CssClass="radioAnswers" ClientIDMode="Static"></asp:radiobuttonlist>

c#

  RadioButtonList1.Items.Add(New ListItem(rsQuestion("a"), "A"))
                RadioButtonList1.Items.Add(New ListItem(rsQuestion("b"), "B"))
                RadioButtonList1.Items.Add(New ListItem(rsQuestion("c"), "C"))
                RadioButtonList1.Items.Add(New ListItem(rsQuestion("d"), "D"))

There's no built in method for that AFAIK. But that shouldn't be too much of an problem to implement a void AddRadioButtonsRandomOrder(RadioButtonList list, List values) — Kilazur, May 14 '14 at 11:43
See this: http://stackoverflow.com/questions/273313/randomize-a-listt-in-c-sharp - it's for list rather than radiobuttonlist but could easily be adapted. — sr28, May 14 '14 at 12:06

score 2 · Accepted Answer · answered May 21 '14 at 13:25

Using the the random class create a list of number qith a range 1 is the starting and 4 being the table number of radio buttons. create another list with you listitems and then loop through the number list and adding them to the index, as that strating has to be a whole number you have to minus one from numbers list

Random ran = new Random();
var numbers = Enumerable.Range(1, 4).OrderBy(i => ran.Next()).ToList();

List<ListItem> ans= new List<ListItem>();
ans.Add(new ListItem(rsQuestion["a"].ToString(), "A"));
ans.Add(new ListItem(rsQuestion["b"].ToString(), "B"));
ans.Add(new ListItem(rsQuestion["c"].ToString(), "C"));
ans.Add(new ListItem(rsQuestion["d"].ToString(), "D"));

foreach (int num in numbers)
{
    RadioButtonList1.Items.Add(ans[num - 1]);
}

score 0 · Answer 2 · answered May 14 '14 at 12:33

0

You have to use 'OrderBy' method to order the data source of your RadioButtonList. And as you want to order it randomly, you have to use a random factor.

For this purpose, you should use 'Random' class in C#.

Use this code : (Place your data source for radio button list instead of 'yourList')

Random ran = new Random();
RadioButtonList1.DataSource = yourList.OrderBy(x => ran.Next()).ToList();

answered May 14 '14 at 12:33

Seyed Hamed Shams

615
9
22

my list is called RadioButtonList1 – user3636426 May 14 '14 at 13:30
RadioButtonList1 is the control that you want to populate it with some data from your database. And 'yourList' is the data source that came from the database. – Seyed Hamed Shams May 14 '14 at 14:10

How to add objects to a RadioButtonList based on random order ?

2 Answers2

Linked