Need help with modifying a line for EventArgs e

Hi, anyone knows what I can replace the bold line with to get it working with EventArgs e? I copied this code from a button function with CommandEventArgs e. Thanks in advance.



protected void btnNextStep_Click(object sender, EventArgs e)
        {
            if (cboxShippingSelect.Checked == true)  
            {
                int addressID = int.Parse(e.CommandArgument.ToString());
                var billingAddress = CustomerManager.GetAddressByID(addressID);
                if (billingAddress != null && NopContext.Current.User != null)
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