ComboBox in WPF

ComboBox In WPF

The Width and Height properties represent the width and the height of a ComboBox.  The x:Name property represents the name of the control, which is a unique identifier of a control. The Margin property sets the location of a ComboBox on the parent control. The HorizontalAlignment and VerticalAlignment properties are used to set horizontal and vertical alignments. 

<ComboBox Name="ComboBox1" Width="200" Height="30"
          VerticalAlignment="Top" HorizontalAlignment="Left"
            Margin="10,10,0,0">           
</ComboBox 

Adding ComboBox Items and Event-

<ComboBox Height="25" Margin="147.5,106.25,163.75,0" Name="comboBox1" 

VerticalAlignment="Top" SelectionChanged="comboBox1_SelectionChanged">
<ComboBoxItem Background="Tomato" BorderBrush="Cyan" >Infosis</ComboBoxItem>
<ComboBoxItem Background="SpringGreen" BorderBrush="Bisque">TCS</ComboBoxItem>
<ComboBoxItem Background="SteelBlue" BorderBrush="Brown">Tech Mahindra</ComboBoxItem>
<ComboBoxItem Background="Violet" BorderBrush="Chartreuse">Birla Soft</ComboBoxItem>
<ComboBoxItem Background="YellowGreen" BorderBrush="Chocolate">AMDOCS</ComboBoxItem>
<ComboBoxItem Background="SteelBlue" BorderBrush="DimGray">Nagarro</ComboBoxItem> 

</ComboBox> 

Output

Code For Event In ComboBox-

private void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            comboBox2.IsEnabled = true;
            comboBox2.Items.Clear();
            if (comboBox1.SelectedIndex  == 0)
            {
                comboBox2.Items.Add("Java");
                comboBox2.Items.Add(".Net");
                comboBox2.Items.Add("PHP");
                comboBox2.Items.Add("Mainframe");
            }
            else if (comboBox1.SelectedIndex == 1)
            {
                comboBox2.Items.Add("SAP");
                comboBox2.Items.Add("ERP");
                comboBox2.Items.Add("Networking");
                comboBox2.Items.Add("C/C++");
            }
            else
            {              
                comboBox2.Items.Add("Networking");
                comboBox2.Items.Add("C/C++");
            }
        }