While integrating the google maps into your project you need to display it using the customized events and customize data which is based on the requirement.

(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);
    });


    google.maps.event.addListener(marker, "mouseover", function (e) {
        infoWindow.setContent(data.description);
        infowindow.open(map, marker);
    });



})(marker, data);


}

So for doing that we need to do that according to the user data available into the datasource.

public string ConvertDataTabletoString()
    {
        DataTable dt = new DataTable();
        using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["DBConnectionString"].ConnectionString))
        {
            using (SqlCommand cmd = new SqlCommand("select title=Company,lat=latitude,lng=longitude,image from MapDimension", con))
            {
                con.Open();
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                da.Fill(dt);
                System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
                List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>();
                Dictionary<string, object> row;
                foreach (DataRow dr in dt.Rows)
                {
                    row = new Dictionary<string, object>();
                    foreach (DataColumn col in dt.Columns)
                    {
                        row.Add(col.ColumnName, dr[col]);
                    }
                    rows.Add(row);
                }
                return serializer.Serialize(rows);
            }
        }