c# - Filter in ComboBox -

i fill combobox database values this:

    public void fillcombo()     {         using (sqlconnection mydatabaseconnection = new sqlconnection(myconnectionstring.connectionstring))         {             mydatabaseconnection.open();             using (sqlcommand mysqlcommand = new sqlcommand("select description librarycongressclassificationoutline", mydatabaseconnection))             using (sqldatareader sqlreader = mysqlcommand.executereader())             {                  while (sqlreader.read())                 {                     string desc = sqlreader.getstring(sqlreader.getordinal("description"));                     combobox1.items.add(desc);                 }             }         }     } 

how filter data when type in combobox , automatically display data in comboxselection something(don't know called) without clicking

you need play autocomplete: http://msdn.microsoft.com/en-us/library/system.windows.forms.combobox.autocompletemode.aspx