Поиск в C#

Вечер добрый , столкнулся с такой проблемой....
пишу программу одну и дошел до создания функции поиска (поиск должен быть по 3 категориям - Имя, Номер рапорта и Номер техники)
суть такова что я сделал поиск по имени, но вот добавить еще 2 категории ну никак не получается (в интернете решение только для Базы Данных, а у меня данные в JSON)

private void SearchBox(object sender, RoutedEventArgs e)
{
try
{
string SearchText = fullname_search.Text.Trim().ToLower();
ICollectionView dataView = CollectionViewSource.GetDefaultView(AppList.ItemsSource);
if (!string.IsNullOrEmpty(SearchText))
{
dataView.Filter = item =>
{
ReportItem reportItem = item as ReportItem;
return reportItem.FullName.ToLower().Contains(SearchText);
};
}
else
{
dataView.Filter = null;
}
} catch (Exception ex) { }
}

CSHARP

        private void SearchBox(object sender, RoutedEventArgs e)

        {

            try

            {

                string SearchText = fullname_search.Text.Trim().ToLower();

                ICollectionView dataView = CollectionViewSource.GetDefaultView(AppList.ItemsSource);

                if (!string.IsNullOrEmpty(SearchText))

                {

                    dataView.Filter = item =>

                    {

                        ReportItem reportItem = item as ReportItem;

                        return reportItem.FullName.ToLower().Contains(SearchText);

                    };

                }

                else

                {

                    dataView.Filter = null;

                }

            }  catch (Exception ex) { }

        }

А разметка у меня вот так

<GroupBox HorizontalAlignment="Left" Height="246" Margin="315,380,0,0" VerticalAlignment="Top" Width="470" FontWeight="Bold" Background="White">
<StackPanel>
<Label>Search</Label>
<Separator/>
<Label Content="Nume/Prenume" HorizontalAlignment="Left" Height="25" Margin="10,10,0,0" VerticalAlignment="Top" Width="150"/>
<TextBox x:Name="fullname_search" HorizontalAlignment="Right" Height="25" Width="255" Margin="0, -23, 15, 0" BorderBrush="Black" VerticalAlignment="Center" Padding="5"/>
<Label Content="Nr. raport" HorizontalAlignment="Left" Height="25" Margin="10,10,0,0" VerticalAlignment="Top" Width="150"/>
<TextBox x:Name="nrraport_search" HorizontalAlignment="Right" Height="25" Width="255" Margin="0, -23, 15, 0" BorderBrush="Black" VerticalAlignment="Center" Padding="5"/>
<Label Content="Nr. tehnica de calcul" HorizontalAlignment="Left" Height="25" Margin="10,10,0,0" VerticalAlignment="Top" Width="150"/>
<TextBox x:Name="nrtehnic_search" HorizontalAlignment="Right" Height="25" Width="255" Margin="0, -23, 15, 0" BorderBrush="Black" VerticalAlignment="Center" Padding="5"/>
<Button x:Name="search" Content="Cautare" HorizontalAlignment="Right" Click="SearchBox" Height="25" Width="125" Margin="0, 30, 15, 0" BorderBrush="Black" Background="White"/>
</StackPanel>
</GroupBox>

CSHARP

<GroupBox HorizontalAlignment="Left" Height="246" Margin="315,380,0,0" VerticalAlignment="Top" Width="470" FontWeight="Bold" Background="White">

    <StackPanel>

        <Label>Search</Label>

        <Separator/>

        <Label Content="Nume/Prenume" HorizontalAlignment="Left" Height="25" Margin="10,10,0,0" VerticalAlignment="Top" Width="150"/>

        <TextBox x:Name="fullname_search" HorizontalAlignment="Right" Height="25" Width="255" Margin="0, -23, 15, 0" BorderBrush="Black" VerticalAlignment="Center" Padding="5"/>

        <Label Content="Nr. raport" HorizontalAlignment="Left" Height="25" Margin="10,10,0,0" VerticalAlignment="Top" Width="150"/>

        <TextBox x:Name="nrraport_search" HorizontalAlignment="Right" Height="25" Width="255" Margin="0, -23, 15, 0" BorderBrush="Black" VerticalAlignment="Center" Padding="5"/>

        <Label Content="Nr. tehnica de calcul" HorizontalAlignment="Left" Height="25" Margin="10,10,0,0" VerticalAlignment="Top" Width="150"/>

        <TextBox x:Name="nrtehnic_search" HorizontalAlignment="Right" Height="25" Width="255" Margin="0, -23, 15, 0" BorderBrush="Black" VerticalAlignment="Center" Padding="5"/>

        <Button x:Name="search" Content="Cautare" HorizontalAlignment="Right" Click="SearchBox" Height="25" Width="125" Margin="0, 30, 15, 0" BorderBrush="Black" Background="White"/>

    </StackPanel>

</GroupBox>