Telerick version 2024.1.130.48, RadDropDownList controls throwing StackoverflowException when migrating visual studio 2010 to 2022

Hello Maheswari,

I appreciate the provided details.

Indeed, I have overlooked that the same exception is raised when setting the DataSource property in selection events. I have already logged this in our Feedback Portal. We are already investigating the item.

I want to elaborate more on the other item that was previously discussed regarding setting the SelectedValue in the SelectedIndexChanged event. We invested time to discuss your complete scenario and we concluded that this is a behavior that is not supported. The standard Microsoft control behaves the same way, and we consider the control behavior that you refer to in the 2013.3.1.1127 version wrong. Setting the SelectedValue property will trigger the SelectedIndexChanged event, and we don't plan to change it in future versions of the controls. The scenario that was fixed here (feedback item) will remove the exception when setting the SelectedValue to an object from the control collection that is already selected. Setting it to a different object will trigger the event again.

I understand that you are unwilling to change the codebase of your application and just to upgrade the version of the Telerik controls. Please note, however, that sometimes when there is such a big distance between the versions, some modifications might be needed. In your scenario, these changes are straight-forward and fairly simple to implement. You have two options.

1. Use the solution with the flag as discussed in the other item: RadDropDownList: StackOverflowException is thrown when setting SelectedValue to a value on the same index in the SelectedIndexChanged event (telerik.com).
2. Create a custom control with special handling of the DataSource property. You can replace every RadDropDownList control in your application with a custom one.

public class MyDropDownList : RadDropDownList
{
    private int suspendEventCount = 0;
 
    public MyDropDownList() { }
 
    public override string ThemeClassName
    {
        get { return typeof(RadDropDownList).FullName; }
        set { base.ThemeClassName = value; }
    }
 
    protected override void OnSelectedIndexChanged(object sender, int newIndex)
    {
        if (this.suspendEventCount > 0)
        {
            return;
        }
 
        base.OnSelectedIndexChanged(sender, newIndex);
    }
 
    public new object DataSource
    {
        get { return base.DataSource; }
        set
        {
            this.suspendEventCount++;
            base.DataSource = value;
            this.suspendEventCount--;
        }
    }
 
    public override object SelectedValue
    {
        get
        {
            return base.SelectedValue;
        }
        set
        {
            this.suspendEventCount++;
            base.SelectedValue = value;
            this.suspendEventCount--;
        }
    }
}

Let me know if this will work for you.

Regards,
Dinko | Tech Support Engineer
Progress Telerik