<asp:LinkButton id="lnk" runat="server" onClientClick="javascript:window.open('asas.aspx');" />
<asp:Button ID="MyButton" runat="server" Text="Go" PostBackUrl="MyPage.aspx" OnClientClick="window.document.forms[0].target='_blank'; setTimeout(function(){window.document.forms[0].target='';}, 500);" ></asp:Button>
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