I will get back to you.

no problem take your time

Refer the below links.

http://stackoverflow.com/questions/12367824/display-pois-using-openlayers-without-a-text-file

http://stackoverflow.com/questions/16814897/using-custom-markers-instead-of-default-marker-openlayers

http://stackoverflow.com/questions/15910968/openlayers-display-all-markers-on-screen

http://stackoverflow.com/questions/20602580/openlayers-displaying-the-markers-on-the-map

hi dharmendr,

i am not getting my answer from hyperlink that is suggested by you.please suggest something relevent

Refer the below link and on gridview row click make ajax call to get the Long & Lat for that selected row and pass the Long Lat to the OpenLayers.Geometry.Point(Long,Lat).

http://stackoverflow.com/questions/26138416/import-sql-data-into-js-array

Refer the below link to call the gridview row click event.

Delete Row from GridView and Database using jQuery in ASP.Net