The easiest way would be to just use:
Response.Redirect("yourPage.aspx");

That way it's not a postback.

Hi Mavrick ,
 I don't think there is inbuilt stuff for clearing the form fields.
 U can write an function to clear the form Collections. In that way u don't
need to clear one by one.

here the code snippet which might help you to iterate thru the form
collections on server side
private void clearFormControls(){
 
    int ctlCount=Convert.ToInt32(Page.Controls.Count.ToString());
    int i;
    TextBox  tempText = new TextBox();
    ListBox  templist = new ListBox();

    for (i=0; i<amtControl; i++)
    {
    switch (Page.Controls[i].GetType())
        {
            case tempText.GetType():
                ((TextBox) Page.Controls[i]).Text = "";
                break;
            case templist.GetType():
                        ((ListBox)Page.Controls[i]).Items.Clear();
                break;
            default:
                break;
        }
    }
}

In the above define your all page controls whatever u have defined and
accordingly clear i.e dropdown etc and call the clearControls function in
your save routine

U can also write and client javascript function to clear the form
collections and mode of submit and check it in onload if the mode is submit
and success clear the controls

Hope this helps you
Thanks

IntelYogi