protected void PopulateBuildingsDdl(DropDownList ddl)
{
ddl.DataSource = BLL.Building.SearchBuildings().Select(i => new { i.Id, i.Name });
ddl.DataValueField = "Id";
ddl.DataTextField = "Name";
ddl.DataBind();
ddl.Items.Insert(0, new ListItem("Select Building", "-1"));
}