c# - How to loop through database table to add data in datagrid? -


i have code read database table datagrid runs once , adds top row datagrid database. there way can run multiple times read data different rows , add in datagrid. 

 public static void adddata( datagrid datagrid)  {         sqlconnection connect = getconnection();         sqlcommand command = new sqlcommand();         command.connection = connect;          //connect database         connect.open();         command.commandtext = "select req_status th_request req_status = 'n'";         command.executenonquery();         status = (string)command.executescalar();         connect.close();          connect.open();         command.commandtext = "select req_date_time th_request req_status = 'n'";         command.executenonquery();         time = (datetime)command.executescalar();         connect.close();          connect.open();         command.commandtext = "select resp_user_name th_request req_status = 'n'";         command.executenonquery();         locationname = (string)command.executescalar();         connect.close();          collection.add(new dataobject()         {              = time,              b = locationname,              c = status,              d = respusername         });         datagrid.itemssource = collection;  }

you should have execute single command once. example use sqldatareader create dataobject each row returned query:

public static void adddata(datagrid datagrid) {     collection.clear();     using (sqlconnection connection = getconnection())     {         using (sqlcommand command = new sqlcommand("select req_status, req_date_time, resp_user_name th_request req_status = 'n'", connection))         {             connection.open();             using (sqldatareader reader = command.executereader())             {                 while (reader.read())                 {                     collection.add(new dataobject()                     {                         = convert.todatetime(reader["req_date_time"]),                         b = convert.tostring(reader["resp_user_name"]),                         c = convert.tostring(reader["req_status"]),                         d = respusername                     });                 }              }         }     }     datagrid.itemssource = collection; }

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