sql - C# get only top 10 highest selling items in database and put it to chart -


hi have code select products sales database , put chart, selecting products. how can 10?

and should query if need opposite top 10 least selling products?

code: 

  private void loadchart()   {     chart1.series[0].points.clear();     chart1.chartareas["chartarea1"].axisx.interval = 1;     using (sqlconnection connection = new sqlconnection("data source=benjopc\\sqlexpress;initial catalog=marischelldatabase;integrated security=true"))     {         sqlcommand command = new sqlcommand("select productname, sum(qtysold) qtysold sales_productholder group productname", connection);          connection.open();          sqldatareader read = command.executereader();          while (read.read())         {             this.chart1.series["pieces sold"].points.addxy(read["productname"], read["qtysold"]);          }         read.close();     } }

try this:

select top 10 productname, sum(qtysold) qtysold  sales_productholder  group productname order sum(qtysold) desc  sqlcommand command = new sqlcommand("select top 10 productname, sum(qtysold) qtysold sales_productholder group productname order sum(qtysold)", connection);

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