Web Forms :: How To Reset All The Panel To Its Original Status After Several PostBack

I have a panel that users are filling blanks in it.

In this process, several post back will be fired and controls like labels, dropdownlists will change their values, nested panels will change their visible.

Now I wish to know how I can reset these changes when user submit the form.

Like

protected void btnSubmit_Click(object sender, EventArgs e)
{
Panel1.Controls.Reset();
//there is no such a method of Panel
}

As a clarification, I still need to use some of the value in the btnSubmit_Click and display some submit info based on these values. So I *cannot* use Response.Redirect().