The type or namespace name 'PriceRangeFilterControl' could not be found

when i add a new page and use the codes blow to bind data to PriceRangeFilter,then the new page show the error message:The type or namespace name 'PriceRangeFilterControl' could not be found ,why?thanks.
code:
var ctrlPriceRangeFilter = CommonHelper.FindControlRecursive<PriceRangeFilterControl>(this.Page.Controls);
ctrlPriceRangeFilter.BindData();