C#

List<post> list = Posts.FindAll(delegate(Post p)
{
     return (p.DateCreated.Date >= dateFrom && p.DateCreated.Date <= dateTo);});
}
</post>

List<sales> list = Sales.FindAll(delegate(Sales s)
{
      //code would go here, but not sure how to do this.
} 
</sales>

private delegate void Update_Delegate(DataTable input);
	
	private void db_list_update(DataTable input){
		//db_list.DataSource = null;
		db_list.EndEdit();
		db_list.Refresh();
		db_list.DataSource = input;
	}
	
	private void db_toggle(object sender, EventArgs e){
		if (db_shown){
			tab_control.TabPages.Remove(db_tab);
			num_tabs_shown--;
			check_tab_visibility();
			db_shown = false;
			//Hide_DB_List();
			db_list.Invoke(new Update_Delegate(this.db_list_update), new object[] {db_test.mysql_query(db_query)});
		}
		else if (!db_shown){
			tab_control.Visible = true;
			tab_control.TabPages.Insert(0,db_tab);
			tab_control.SelectedTab = db_tab;
			num_tabs_shown++;
			check_tab_visibility();		
			Show_DB_List();
			db_list.Invoke(new Update_Delegate(this.db_list_update), new object[] {db_test.mysql_query(db_query)});
			db_shown = true;
		}
		db_test = null;
		
	}