Data Binding- in ComboBox(relative to other combo box)

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Hi All,

I have two combo box, and need to set the values of latter combobox relative to the former combo box.
for eg.,
Combobox(I) - values A, B & C
ComboBox(II) - values 0, 1, 2 ,3,4,5,6,7,8,9

On user Selection of (I) and Type A- (II) - values 0,1,2
On user Selection of (I) and Type B- (II) - values 1...9
On User selection of (I) and Type C- (III) - values 9 Only, needs selection.

How to effect the said changes. Any help is appreciable. Thanks.,

With Regards,
Samanth_90

Posted 26-Mar-12 19:02pm

Member 7985084

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Amir Mahfoozi · Accepted Answer · 2012-03-26T20:33:00

You need to have a SelectionChanged event handler :
XAML code :

HTML

<combobox height="23" horizontalalignment="Left" margin="12,41,0,0" name="comboBox1" verticalalignment="Top" width="120" selectionchanged="comboBox1_SelectionChanged">
            <comboboxitem content="A" />
            <comboboxitem content="B" />
            <comboboxitem content="C" />
        </combobox>
        <combobox height="23" horizontalalignment="Left" margin="12,84,0,0" name="comboBox2" verticalalignment="Top" width="120" />

Code behind :

in Loaded event handler (of your Window or Page or User Control) :

C#

comboBox1.SelectedIndex = 0;

and the SelectionChanged event handler :

C#

private void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if (comboBox2 == null)
        return;

    switch (comboBox1.SelectedIndex)
    {
        case 0:
            comboBox2.ItemsSource = new List<int> { 0, 1, 2 };
            break;
        case 1:
            comboBox2.ItemsSource = new List<int> { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
            break;
        case 2:
            comboBox2.ItemsSource = new List<int> { 9 };
            break;
    }

    comboBox2.SelectedIndex = 0;
}

Hope it helps.