How do I generate selected index changed event on dynamic drop down list ASP.NET C#

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Hello,
i am trying to generate selected index changed event on dynamic drop down list.code is running but event is not triggering.will deeply appreciate any help
regards,

What I have tried:

C#

DropDownList myDdl= new DropDownList();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
            {
                getDdl();
            }
myDdl.SelectedIndexChanged += new EventHandler(myDdl_SelectedIndexChanged);
}

void getDdl()
        {
           for (int i=0;i<=4;i++)
            {
                ListItem li = new ListItem("list item "+i.ToString(),i.ToString());
                myDdl.Items.Add(li);
            }
form1.Controls.Add(myDdl);
        }

protected void myDdl_SelectedIndexChanged(object sender, EventArgs e)
        {
            Response.Write(myDdl.SelectedItem.Text);
                               }

Posted 4-Nov-20 22:39pm

Aftab Iqbal Clips

Updated 4-Nov-20 22:49pm

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Richard Deeming · Accepted Answer · 2020-11-04T22:50:00

Solution 1

When you add controls dynamically to a WebForms page, you need to recreate them every time the page is posted back. You will also need to wire up any event handlers on each request, and make sure the control is added early enough in the page lifecycle for the events to fire.

C#

protected void Page_Init(object sender, EventArgs e)
{
    getDdl();
    myDdl.SelectedIndexChanged += myDdl_SelectedIndexChanged;
}

Posted 4-Nov-20 22:50pm

Richard Deeming

Comments

Aftab Iqbal Clips 5-Nov-20 8:02am

tried your code bro but nothing happened issue remains the same code runs but selected index changed event not triggering can you please have a look at this once again
thanks

Aftab Iqbal Clips 5-Nov-20 9:05am

now its working,was not setting autopostback property to true.

akshaykokil 14-Jan-21 9:45am

Works correctly..Thank You!