How to prevent the entire page from reloading on updating a single control within GridView?

<asp:ImageButton ID="lnklike" runat="server" ImageUrl="~/Images/thumbsup.png" height="20px" Width="20px" CommandName="like" CommandArgument='<%# Eval("ScrapId")%>'/>

                <asp:UpdatePanel runat="server" id="UpdatePanel" updatemode="Conditional">
        <Triggers>
            <asp:AsyncPostBackTrigger controlid="lnklike" eventname="Click" />
        </Triggers>
            <ContentTemplate>
                &nbsp;<asp:Label ID="Label1" runat="server" Text='<%# Controls_GetUserScraps.abc((int)Eval("ScrapId")) %>' />

     </ContentTemplate>
        </asp:UpdatePanel>

protected void GridViewRowCommand(Object sender, GridViewCommandEventArgs e)
    {

        var scrapId = Int32.Parse(e.CommandArgument.ToString());
        
        
        switch (e.CommandName)
        {
            case "like":
                GridViewRow row = (GridViewRow)(((ImageButton)e.CommandSource).NamingContainer);

    int index = row.RowIndex;

                string chklike = "select likestatus from tbl_like where fromid='" + Session["UserId"] + "' and scrapid='" + scrapId + "'";
                int a = dbo.GetLikesMethod(chklike);
                string chkthumbsdown = "select thumbsdownstatus from tbl_like where fromid='" + Session["UserId"] + "' and scrapid='" + scrapId + "'";
                int b = dbo.GetLikesMethod(chkthumbsdown);

                if (a == 0 && b == 0)
                {
                    string sendlike = "insert into tbl_like (ScrapId,FromId,LikeStatus) values('" + scrapId + "','" + Session["UserId"] + "',1)";
                    dbo.insert(sendlike);
                    
                    Label lbl=(Label)GridViewUserScraps.Rows[index].FindControl("Label1");
                    lbl.Text = "20";
                    //GetUserScraps(int.Parse(Request.QueryString["Id"].ToString()));
                }