c# - labels in google column charts -


i'm using asp c# , followed tutorial create google charts http://www.dotnetfox.com/articles/create-google-column-chart-from-database-in-asp-net-1066.aspx

but need add labels each of bars in charts looks similar this: https://jsfiddle.net/5bd2lkyq/

i dont know how or add anotation:

      var data = google.visualization.arraytodatatable([  ['city', '2010 population', {type: 'string', role: 'annotation'}, '2000 population', {type: 'string', role: 'annotation'}],

i got work

   str.append("var view = new google.visualization.dataview(data);");      str.append(" view.setcolumns([0,1,{role: 'annotation',type: 'string',calc: 'stringify',  sourcecolumn: 1}]);");

then change data view

 str.append(" chart.draw(view, options);}");

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