public void GetClientIdAndContractId()
{
var distinctClientId = ClientList.GroupBy(x => x.ClientId).Select(y => y.First());
List <int> clientIdList = new List <int>();
foreach (var clientId in distinctClientId)
{
clientIdList.Add(clientId.ClientId);
}
DistinctClientIdList = clientIdList;
int selectedClientId = clientIdList[_clientIndex];
List <int> contractIdList = new List <int>();
foreach (var contractId in ClientList.Where(x => x.ClientId == selectedClientId))
{
contractIdList.Add(contractId.ContractId);
}
SelectedClientId = selectedClientId;
ContractIdList = contractIdList;
SelectedContractId = ContractIdList[ContractIndex];
}