private void Searching() { Contracts = CollectionConverter <v_contract> .ConvertToObservableCollection(_eF.GetContracts(ListSelectedProductionProcess.ToList(), new Range <DateTime>(BeginValueDateOfConclusionContract, EndValueDateOfConclusionContract), new Range <int>(BeginValueDepositPayed, EndValueDepositPayed), new Range <int>(BeginValueContractTotalPrice, EndValueContractTotalPrice), new Range <int>(BeginValueContractTotalPriceInclVAT, EndValueContractTotalPriceInclVAT))); }