Hi,
Write a javascript function as below:
function openPopup()
{
var catID = document.getElementById("lblCategoryID").value;
window.open('PopUpLabtest.aspx?CategoryID =' + catID ,'height=400,width=700,scrollbars=yes,location=no,menubar=yes,status=no');
}
and use it in your .aspx page.
<asp:HyperLink ID="hlPopLabTest" runat="server" CssClass="lnk" Text='<%# Eval("CategoryName")%
NavigateUrl="javascript:openPopup()"></asp:HyperLink>
Microsoft MVP - ASP/ASP.NET