Programmatic adding items to radCheckedDropDownList throws error

[Daniel]

Hi all

I'm working with Visual Studio 2017, .NET 4.6.1, Telerik UI for WinForms 2018.2.621

This is the code:

 

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using Telerik.WinControls.UI;

namespace TelerikTest
{
    public partial class Form1 : Form
    {
        private List<string> list = new List<string>() { "one", "two", "three" };
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            radCheckedDropDownList1.Items.Clear();

            foreach (string item in list)
            {
                radCheckedDropDownList1.Items.Add(new RadCheckedListDataItem(item, false));
            }
        }
    }
}

If I fill the radCheckedDropDownList after having selected an item by click (SelectByClick.png) all is fine.

If I fill the radCheckedDropDownList after having selected an item using autocomplete (SelectByAutoComplete.png), I get a NullReferenceException (NullReferenceException.png).

 

Could someone please tell me, what I'm doing wrong?

 

Thanks in advance

Daniel

[Dess | Tech Support Engineer, Principal]

Hello, Daniel,          

Your question has already been answered in the support thread you have opened on the same topic. Please, see our answer there for more information. However, I am posting the answer here as well in order the community to benefit from it. I have logged it in our feedback portal. You can track its progress, subscribe for status changes and add your comments on the following link - feedback item.

We kindly ask you to use just one thread for a specific problem to contact us. Posting the same questions numerous times slows down our response time because we will need to review and address two or more tickets instead of one. Moreover, threads are handled according to license and time of posting, so if it is an urgent problem, we suggest you use a support ticket, which would be handled before a forum thread.

Thank you for your understanding.

Regards,
Dess
Progress Telerik