how find targetcontrolid in modalpopupextender from datalist

Hi Gaurav,

You can have button and set the targetcontrolid to the modalpopupextender like the below example:

"server" ID="btnShowModalPopup" style="display:none"/>
"ModalPopupExtender1" runat="server"TargetControlID="btnshowModalPopup" PopupControlID="divPopUp"PopupDragHandleControlID="panelD" DropShadow="true" BackgroundCssClass="popUpStyle">
asp:ModalPopupExtender>

Here is the complete reference of the article:

http://www.c-sharpcorner.com/UploadFile/364074/display-detail-data-with-the-modalpopupextender-control-in-a/

Thanks