How to set multiple selected values in asp.net checkboxlist

I know this is an old post but I had the same problem recently.

To select multiple items of a DataBound CheckBoxList, handle the DataBound event and loop through the Items collection setting the Selected property individually on each item as required.

Setting the SelectedValue property of the control only checks the final item.

 foreach (ListItem item in MyCheckBoxList.Items)
 {
     item.Selected = ShouldItemBeSelectedMethod(item.Value);
 }

Nice method I use:

 private void SetCheckBoxListValues(CheckBoxList cbl, string[] values)
        {
            foreach (ListItem item in cbl.Items)
            {
                item.Selected = values.Contains(item.Value);
            }
        }

public void SetValueCheckBoxList(CheckBoxList cbl, string sValues)
        {
            if (!string.IsNullOrEmpty(sValues))
            {                
                ArrayList values = StringToArrayList(sValues);             
                foreach (ListItem li in cbl.Items)
                {
                    if (values.Contains(li.Value))
                        li.Selected = true;
                    else
                        li.Selected = false;                    
                }               
            }
        }

private ArrayList StringToArrayList(string value)
        {
            ArrayList _al = new ArrayList();
            string[] _s = value.Split(new char[] { ',' });

            foreach (string item in _s)
                _al.Add(item);

            return _al;
        }

Thanks, slnavn2000

Sounds like a Page Lifecycle - Databinding question.

You should really take a look at (the answers to) this question.

I used the DataBound event to select to set the selected items.

Lets say your values are string array. Then I would do it this way

foreach (ListItem li in ctrl.Items)
   li.Selected = Array.Exists(values, x => x == li.Value);

set checkboxlist selected items from a list:

        List<int> yourlist;
        //fill yourlist
        foreach (ListItem item in checkboxlist.Items)
        {
            if (yourlist.Contains(int.Parse(item.Value.ToString())))
                item.Selected = true;                
        }