CODE EXAMPLE FOR CSHARP

wpf combobox filter as you type

<ComboBox x:Name="comboBox" HorizontalAlignment="Left" SelectedValuePath="Content" SelectedValue="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Text}" VerticalAlignment="Top" Width="120" Margin="121,100,0,0"  IsEditable="True" KeyUp="comboBox_KeyUp" IsTextSearchEnabled="False">
    <ComboBoxItem Content="apple"/>
    <ComboBoxItem Content="banana"/>
    <ComboBoxItem Content="grape"/>
    <ComboBoxItem Content="lemon"/>
    <ComboBoxItem Content="strawberry"/>
</ComboBox>