how to give default button as finishnavigatetemplate finish button of Wizard Control in asp.net4.0

The DefaultButton (as you can set in your form tag <form id="form1" runat="server" DefaultButton="btnFinished">) will determine which buttons click event will be fired on a default submit. (like if a user hits enter while in a textbox)

You can attach events to all your buttons. If you attach an event to your btnFinish-button that event will trigger when you click that specific button.

<form id="form1" runat="server" DefaultButton="btnFinish">
<!-- the rest of your form... -->
<asp:Button runat="server" value="I'm done. Send my data" id="btnFinish" OnClick="btnFinish_Click"/>
</form>

protected void btnFinish_Click(object sender, EventArgs e)
{
    // Save your data from wizard and move on..
}