private void Searching()
{
Users = CollectionConverter <v_user> .ConvertToObservableCollection(_eF.GetUsers(FilterText,
RoleName,
new Range <DateTime>(BeginValueDateOfRegistration.Date, EndValueDateOfRegistration.AddHours(23).AddMinutes(59).AddSeconds(59)),
new Range <DateTime>(BeginValueDateOfLastChangePassword.Date, EndValueDateOfLastChangePassword.AddHours(23).AddMinutes(59).AddSeconds(59)),
new Range <DateTime>(BeginValueWasOnline.Date, EndValueWasOnline.Date.AddHours(23).AddMinutes(59).AddSeconds(59))));
}