javascript - How to insert latitude and longitude in database from click event? -


using asp. trying store user's location (latitude, longitude) database. presents problem:

i want values of longitude , latitude of google map clicking button got 0 values in database.. database ha 2 filed longitude , latitude has decimal datatype.

and getting error

an-unhandled-exception-of-type-system-data-sqlclient-sqlexception-occured-in-system-data-dll in cmd1.executenonquery(); line

here's sample code of first attempt:

<html xmlns="http://www.w3.org/1999/xhtml">     <head id="head1" runat="server">    <title></title> </head> <body>    <script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>    <script type="text/javascript">        var long = 0;        var lat = 0;        window.onload = function () {            var mapoptions = {                center: new google.maps.latlng(18.9300, 72.8200),                zoom: 14,                maptypeid: google.maps.maptypeid.roadmap            };            var infowindow = new google.maps.infowindow();            var latlngbounds = new google.maps.latlngbounds();            var map = new google.maps.map(document.getelementbyid("dvmap"), mapoptions);            google.maps.event.addlistener(map, 'click', function (e) {                long = e.latlng.lng();                lat = e.latlng.lat();                document.getelementbyid("lat").value = lat;                document.getelementbyid("lng").value = long;                alert("latitude: " + lat + "\r\nlongitude: " + long);            });        }    </script>  <form id="myform" runat="server">    <div id="dvmap" style="width: 300px; height: 300px">    </div>    <asp:hiddenfield id="lat" runat="server" />    <asp:hiddenfield id="lng" runat="server" />    <asp:button id="button1" runat="server" text="button" onclick="button1_click" />  </form> </body>

and below .aspx code-behind file. save longitude , latitude database during click event of button:

  protected void button1_click(object sender, eventargs e)     {           decimal latitude = convert.todecimal(lat.value);         decimal longitude = convert.todecimal(lng.value);             string constr = configurationmanager.connectionstrings["constr"].connectionstring;             sqlconnection con = new sqlconnection(constr);           string query1 = "insert courses(longi,lati) values (@lati, @longi)";          sqlcommand cmd1 = new sqlcommand(query1, con);         cmd1.parameters.addwithvalue("@lati", latitude);         cmd1.parameters.addwithvalue("@longi", longitude);                  con.open();                  cmd1.executenonquery();                   con.close();         }

you may not getting value in hidden fields null values going database causing error. , not getting values in hidden fields because have made these runat="server" there id changed , setting values in javascript id id have changed. need set clientidmode property of hidden fields static this

<asp:hiddenfield id="lat"  clientidmode="static" runat="server" /> <asp:hiddenfield id="lng"  clientidmode="static" runat="server" />

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