if button click should open in new window

When we should press the Title link in Grid view it redirected to related link in new tab:

 <asp:GridView ID="gdv" runat="server" AutoGenerateColumns="false" PageSize="50" 

            onrowcommand="gdv_RowCommand">

    <Columns>

 <asp:TemplateField>

      <ItemTemplate>

        <asp:LinkButton ID="lnk" runat="server" Text='<%# Eval("title") %>' CommandName="Show" CommandArgument='<%#DataBinder.Eval(Container.DataItem,("link"))%>' OnClientClick="document.getElementById('form1').target ='_blank';"></asp:LinkButton>

    </ItemTemplate>

    </asp:TemplateField>

  </Columns>

     </asp:GridView>