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Updated the ug document for token event.
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‎WindowsForms/ComboBox/Token.md‎

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@@ -62,3 +62,133 @@ sfComboBox1.Style.TokenStyle.Font = New Font(“Arial”, 10F, FontStyle.Bold)
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* Using the <kbd>Down Arrow</kbd>, <kbd>Up Arrow</kbd>, and <kbd>Enter</kbd> keys, item can be selected from the combobox.
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* Using the <kbd>Backspace</kbd> key, the last positioned token will be removed from the text area.
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* When the <kbd>Esc</kbd> key is pressed, the drop-down area will be closed if it has been opened already.
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## Events Fired When Selecting and Deselecting Tokens
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The events [SelectedValueChanged](https://help.syncfusion.com/cr/windowsforms/Syncfusion.WinForms.ListView.SfComboBox.html#Syncfusion_WinForms_ListView_SfComboBox_SelectedValueChanged) and [SelectedIndexChanged](https://help.syncfusion.com/cr/windowsforms/Syncfusion.WinForms.ListView.SfComboBox.html#Syncfusion_WinForms_ListView_SfComboBox_SelectedIndexChanged) are triggered when tokens are selected or deselected in the SfComboBox control.
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{% tabs %}
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{% highlight c# %}
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private List<object> _previousSelectedTokens;
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SfComboBox sfComboBox1 = new SfComboBox
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{
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EnableToken = true,
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DisplayMember = "Name",
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ValueMember = "Id",
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};
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// Set the DataSource
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sfComboBox1.DataSource = new List<dynamic>
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{
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new { Id = 1, Name = "Item1" },
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new { Id = 2, Name = "Item2" },
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new { Id = 3, Name = "Item3" }
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};
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sfComboBox1.SelectedItems.Add(sfComboBox1.DropDownListView.View.DisplayItems[0]);
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_previousSelectedTokens = sfComboBox1.SelectedItems.Cast<object>().ToList();
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sfComboBox1.SelectedValueChanged += SfComboBox1_SelectedValueChanged;
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sfComboBox1.SelectedIndexChanged += SfComboBox1_SelectedIndexChanged;
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this.Controls.Add(sfComboBox1);
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private void TokenComboBox_SelectedValueChanged(object sender, EventArgs e)
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{
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var comboBox = sender as SfComboBox;
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// Get the current selected tokens
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var currentSelectedTokens = comboBox.SelectedItems.Cast<dynamic>().ToList();
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// Determine added tokens
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var addedTokens = currentSelectedTokens.Except(_previousSelectedTokens).ToList();
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// Determine removed tokens
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var removedTokens = _previousSelectedTokens.Except(currentSelectedTokens).ToList();
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// Update the previous token list
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_previousSelectedTokens = currentSelectedTokens;
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// Handle added tokens
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foreach (var token in addedTokens)
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{
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MessageBox.Show($"Token Added: {token.Name}", "Token Added");
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// Additional logic for added tokens
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}
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// Handle removed tokens
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foreach (var token in removedTokens)
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{
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MessageBox.Show($"Token Removed: {token.Name}", "Token Removed");
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// Additional logic for removed tokens
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}
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}
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private void TokenComboBox_SelectedIndexChanged(object sender, EventArgs e)
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{
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// Handle the event when the selection changes (tokens are selected or deselected)
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}
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{% endhighlight %}
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{% highlight vb %}
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Private _previousSelectedTokens As List(Of Object)
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' Initialize the SfComboBox
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Dim sfComboBox1 As New SfComboBox() With {
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.EnableToken = True,
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.DisplayMember = "Name",
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.ValueMember = "Id"
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}
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' Set the DataSource
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sfComboBox1.DataSource = New List(Of Object) From {
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New With {.Id = 1, .Name = "Item1"},
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New With {.Id = 2, .Name = "Item2"},
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New With {.Id = 3, .Name = "Item3"}
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}
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' Add initial tokens
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sfComboBox1.SelectedItems.Add(sfComboBox1.DropDownListView.View.DisplayItems(0))
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_previousSelectedTokens = sfComboBox1.SelectedItems.Cast(Of Object).ToList()
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' Subscribe to events
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AddHandler sfComboBox1.SelectedValueChanged, AddressOf TokenComboBox_SelectedValueChanged
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AddHandler sfComboBox1.SelectedIndexChanged, AddressOf TokenComboBox_SelectedIndexChanged
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' Add SfComboBox to the form
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Me.Controls.Add(sfComboBox1)
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Private Sub TokenComboBox_SelectedValueChanged(sender As Object, e As EventArgs)
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Dim comboBox = TryCast(sender, SfComboBox)
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' Get the current selected tokens
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Dim currentSelectedTokens = comboBox.SelectedItems.Cast(Of Object).ToList()
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' Determine added tokens
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Dim addedTokens = currentSelectedTokens.Except(_previousSelectedTokens).ToList()
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' Determine removed tokens
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Dim removedTokens = _previousSelectedTokens.Except(currentSelectedTokens).ToList()
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' Update the previous token list
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_previousSelectedTokens = currentSelectedTokens
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' Handle added tokens
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For Each token In addedTokens
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MessageBox.Show($"Token Added: {token.Name}", "Token Added")
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' Additional logic for added tokens
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Next
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' Handle removed tokens
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For Each token In removedTokens
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MessageBox.Show($"Token Removed: {token.Name}", "Token Removed")
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' Additional logic for removed tokens
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Next
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End Sub
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Private Sub TokenComboBox_SelectedIndexChanged(sender As Object, e As EventArgs)
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' Handle the event when the selection changes (tokens are selected or deselected)
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End Sub
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{% endhighlight %}
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{% endtabs %}
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![Event fired when Selecting/Unselecting token item](Token_images/Token_Event.gif)

‎WindowsForms/ComboBox/Token_images/Token_Event.gif‎

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