How to find container of dynamically created button ASP.net

I have a WebForm whose controls are created dynamically as they can vary in number. Each element is a Panel containing a TextBox, a DropDownList and a Button.
Each control is given a unique ID and all the buttons have the same clickEvent. Inside the code of the clickEvent, I want to obtain the ID of the panel in which the presedButton belongs so I can access the chosen value from that Panel’s DropDownList and the text from the TextBox.
How can I do the above?

Answers:

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Method 1

private void button1_Click(object sender, EventArgs e)
    {
        var panelId = ((Button)sender).Parent.ID;

    }

Or you could get the controls directly

private void button1_Click(object sender, EventArgs e)
    {

        var myTextbox = ((Button)sender).Parent.Controls.OfType<TextBox>().FirstOrDefault();
        var myDropDownlist = ((Button)sender.Parent.Controls.OfType<DropDownList>().FirstOrDefault();

    }

or by control ID:

private void button1_Click(object sender, EventArgs e)
    {

        var myTextbox = ((Button)sender).Parent.Controls.OfType<TextBox>().Where(x => x.ID == "textboxID").SingleOrDefault();
        var myDropDownlist = ((Button)sender).Parent.Controls.OfType<DropDownList>().Where(x => x.ID == "dropdownlistID").SingleOrDefault();

    }

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