Hi Amol111,
I have created sample code which fulfill your requirement.You need to modify as per your requirement.
HTML
<asp:HyperLink ID="HyperLink1" runat="server" Text="See Chart" NavigateUrl='<%# "https://google.com/Empnumber="+lblTest.Text%>'
Target="_blank" />
<asp:Label ID="lblTest" Text="3" runat="server" />
C#
protected void Page_Load(object sender, EventArgs e)
{
HyperLink1.DataBind();
}
Screenshot