CS0103: The name 'ConvertDataTabletoString' does not exist in the current context

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hi all,
Iam trying to use below code but showing this above problem.Please,help me to find out the solution.On page load,I have added a method name that is ConvertDataTabletoString() and iam trying to call the method...This code I have taken from below links

http://www.aspdotnet-suresh.com/2013/05/aspnet-show-multiple-markers-on-google.html[^]
var markers = JSON.parse('<%=ConvertDataTabletoString() %>');\\ error here

<script type="text/javascript">
function initialize() {
var markers = JSON.parse('<%=ConvertDataTabletoString() %>');\\ error here
var mapOptions = {
center: new google.maps.LatLng(markers[0].lat, markers[0].lng),
zoom: 5,
mapTypeId: google.maps.MapTypeId.ROADMAP
// marker:true
};
var infoWindow = new google.maps.InfoWindow();
var map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
for (i = 0; i < markers.length; i++) {
var data = markers[i]
var myLatlng = new google.maps.LatLng(data.lat, data.lng);
var marker = new google.maps.Marker({
position: myLatlng,
map: map,
title: data.title
});
(function (marker, data) {

// Attaching a click event to the current marker
google.maps.event.addListener(marker, "click", function (e) {
infoWindow.setContent(data.description);
infoWindow.open(map, marker);
});
})(marker, data);
}
}
google.setOnLoadCallback(initialize);
</script>