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    <p>You have to use a WPF TextBox to make spell checking work. You can embed one in a Windows Forms form with the ElementHost control. It works pretty similar to a UserControl. Here's a control that you can drop straight from the toolbox. To get started, you need Project + Add Reference and select WindowsFormsIntegration, System.Design and the WPF assemblies PresentationCore, PresentationFramework and WindowsBase.</p> <p>Add a new class to your project and paste the code shown below. Compile. Drop the SpellBox control from the top of the toolbox onto a form. It supports the TextChanged event and the Multiline and WordWrap properties. There's a nagging problem with the Font, there is no easy way to map a WF Font to the WPF font properties. The easiest workaround for that is to set the form's Font to "Segoe UI", the default for WPF.</p> <pre><code>using System; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Windows; using System.Windows.Controls; using System.Windows.Forms.Integration; using System.Windows.Forms.Design; [Designer(typeof(ControlDesigner))] //[DesignerSerializer("System.Windows.Forms.Design.ControlCodeDomSerializer, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", "System.ComponentModel.Design.Serialization.CodeDomSerializer, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")] class SpellBox : ElementHost { public SpellBox() { box = new TextBox(); base.Child = box; box.TextChanged += (s, e) =&gt; OnTextChanged(EventArgs.Empty); box.SpellCheck.IsEnabled = true; box.VerticalScrollBarVisibility = ScrollBarVisibility.Auto; this.Size = new System.Drawing.Size(100, 20); } public override string Text { get { return box.Text; } set { box.Text = value; } } [DefaultValue(false)] public bool Multiline { get { return box.AcceptsReturn; } set { box.AcceptsReturn = value; } } [DefaultValue(false)] public bool WordWrap { get { return box.TextWrapping != TextWrapping.NoWrap; } set { box.TextWrapping = value ? TextWrapping.Wrap : TextWrapping.NoWrap; } } [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] public new System.Windows.UIElement Child { get { return base.Child; } set { /* Do nothing to solve a problem with the serializer !! */ } } private TextBox box; } </code></pre> <p>By popular demand, a VB.NET version of this code that avoids the lambda:</p> <pre><code>Imports System Imports System.ComponentModel Imports System.ComponentModel.Design.Serialization Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Forms.Integration Imports System.Windows.Forms.Design &lt;Designer(GetType(ControlDesigner))&gt; _ Class SpellBox Inherits ElementHost Public Sub New() box = New TextBox() MyBase.Child = box AddHandler box.TextChanged, AddressOf box_TextChanged box.SpellCheck.IsEnabled = True box.VerticalScrollBarVisibility = ScrollBarVisibility.Auto Me.Size = New System.Drawing.Size(100, 20) End Sub Private Sub box_TextChanged(ByVal sender As Object, ByVal e As EventArgs) OnTextChanged(EventArgs.Empty) End Sub Public Overrides Property Text() As String Get Return box.Text End Get Set(ByVal value As String) box.Text = value End Set End Property &lt;DefaultValue(False)&gt; _ Public Property MultiLine() As Boolean Get Return box.AcceptsReturn End Get Set(ByVal value As Boolean) box.AcceptsReturn = value End Set End Property &lt;DefaultValue(False)&gt; _ Public Property WordWrap() As Boolean Get Return box.TextWrapping &lt;&gt; TextWrapping.NoWrap End Get Set(ByVal value As Boolean) If value Then box.TextWrapping = TextWrapping.Wrap Else box.TextWrapping = TextWrapping.NoWrap End If End Set End Property &lt;DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)&gt; _ Public Shadows Property Child() As System.Windows.UIElement Get Return MyBase.Child End Get Set(ByVal value As System.Windows.UIElement) '' Do nothing to solve a problem with the serializer !! End Set End Property Private box As TextBox End Class </code></pre>
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    1. COI'm trying to implement your solution: What is the (s,e) part of the code means? Because I am getting a compiler error for it?
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    2. COIt is a lambda expression, VS2008 required. Just delete it and let intellisense add a regular method instead.
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    3. COErm, come to think of it, you have to have VS2008 if you use WPF?
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