you can do this by simply provide the validation group name to Page_ClientValidate
<asp:LinkButton OnClientClick="Page_ClientValidate('Your_ValidationGroup_Name'); if(Page_IsValid==false) { console.log('validate'); return false; }"
ID="LinkButton1" ValidationGroup="validPanel1" runat="server">Check</asp:LinkButton>
kindly check this question. It's about another problem but he first do what you want to do.