How to open a modal popup after click of hyperlink using ASP.NET

How to display text in modal popup from the grid's cell by clicking the hyperlink
In jquery part I used window.open the code I wrote opened a new popup window so I changed it to modal popup but it loads while pageload before the click of hyperlink and blurs the entire main page so what is the code I need to change to make the process right and also displsy the modal popup after click
I have wrote my sample code here

<asp:TemplateField>
<ItemTemplate>
<asp:HyperLink ID="lnkRedirect" NavigateUrl="#myModal"
Text='<%#Eval("content").ToString().Length > 11 ? Eval("content").ToString().Substring(0, 11) : Eval("content").ToString()%>'runat="server" />
</ItemTemplate>
</asp:TemplateField>

<div class="modal fade" id="myModal" role="dialog">
<div class="modal-dialog">

<div class="modal-content">
<div class="modal-header">
</div>
<div class="modal-body">
<p id=modal_body></p>
</div>


<div class="modal-footer">
<button type="button" class="btn btn-info" data-dismiss="modal">
Close</button>
</div>
</div>
</div>
</div>