Hello,
There is one property called "Target" in hyperlink control. These are the detail of Target property.
_blank: Renders the content in a new window without frames.
_parent: Renders the content in the immediate frameset parent.
_search: Renders the content in the search pane.
_self: Renders the content in the frame with focus.
_top: Renders the content in the full window without frames.
So your solution would be:
<asp:hyperlinkfield target="_blank" datatextfield=" total guarantor" text="Total Guarantor" headertext="Total Guarantor" navigateurl="~/guarantoedetails.aspx" />