Hi Ritesh,

I apologize for the delayed response. I have tested your scenario again with build 1013 but still encountered nothing unusual. As I am using the same markup for the drop down as you, it may help to know how you are adding the items in the drop down.

Below is the code I used in the code-behind:

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            for (int i = 0; i < 200; i++)
            {
                ddlSelect.Items.Add(new Infragistics.Web.UI.ListControls.DropDownItem(i.ToString(), i.ToString() ));

            }
        }
    }
    protected void ddlSelect_OnValueChanged(object sender, Infragistics.Web.UI.ListControls.DropDownValueChangedEventArgs e)
    {
        Debug.WriteLine("OnValueChanged executed !");
    }

Hi Ritesh,

Thank you for your response. Do not hesitate to contact me if you continue to experience any issues.

Best Regards,