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    <p>You can restrict the input to numbers only using an attached property on the TextBox. Define the attached property once (even in a separate dll) and use it on any TextBox. Here is the attached property:</p> <pre><code> using System; using System.Windows; using System.Windows.Controls; using System.Windows.Input; /// &lt;summary&gt; /// Class that provides the TextBox attached property /// &lt;/summary&gt; public static class TextBoxService { /// &lt;summary&gt; /// TextBox Attached Dependency Property /// &lt;/summary&gt; public static readonly DependencyProperty IsNumericOnlyProperty = DependencyProperty.RegisterAttached( "IsNumericOnly", typeof(bool), typeof(TextBoxService), new UIPropertyMetadata(false, OnIsNumericOnlyChanged)); /// &lt;summary&gt; /// Gets the IsNumericOnly property. This dependency property indicates the text box only allows numeric or not. /// &lt;/summary&gt; /// &lt;param name="d"&gt;&lt;see cref="DependencyObject"/&gt; to get the property from&lt;/param&gt; /// &lt;returns&gt;The value of the StatusBarContent property&lt;/returns&gt; public static bool GetIsNumericOnly(DependencyObject d) { return (bool)d.GetValue(IsNumericOnlyProperty); } /// &lt;summary&gt; /// Sets the IsNumericOnly property. This dependency property indicates the text box only allows numeric or not. /// &lt;/summary&gt; /// &lt;param name="d"&gt;&lt;see cref="DependencyObject"/&gt; to set the property on&lt;/param&gt; /// &lt;param name="value"&gt;value of the property&lt;/param&gt; public static void SetIsNumericOnly(DependencyObject d, bool value) { d.SetValue(IsNumericOnlyProperty, value); } /// &lt;summary&gt; /// Handles changes to the IsNumericOnly property. /// &lt;/summary&gt; /// &lt;param name="d"&gt;&lt;see cref="DependencyObject"/&gt; that fired the event&lt;/param&gt; /// &lt;param name="e"&gt;A &lt;see cref="DependencyPropertyChangedEventArgs"/&gt; that contains the event data.&lt;/param&gt; private static void OnIsNumericOnlyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { bool isNumericOnly = (bool)e.NewValue; TextBox textBox = (TextBox)d; if (isNumericOnly) { textBox.PreviewTextInput += BlockNonDigitCharacters; textBox.PreviewKeyDown += ReviewKeyDown; } else { textBox.PreviewTextInput -= BlockNonDigitCharacters; textBox.PreviewKeyDown -= ReviewKeyDown; } } /// &lt;summary&gt; /// Disallows non-digit character. /// &lt;/summary&gt; /// &lt;param name="sender"&gt;The source of the event.&lt;/param&gt; /// &lt;param name="e"&gt;An &lt;see cref="TextCompositionEventArgs"/&gt; that contains the event data.&lt;/param&gt; private static void BlockNonDigitCharacters(object sender, TextCompositionEventArgs e) { foreach (char ch in e.Text) { if (!Char.IsDigit(ch)) { e.Handled = true; } } } /// &lt;summary&gt; /// Disallows a space key. /// &lt;/summary&gt; /// &lt;param name="sender"&gt;The source of the event.&lt;/param&gt; /// &lt;param name="e"&gt;An &lt;see cref="KeyEventArgs"/&gt; that contains the event data.&lt;/param&gt; private static void ReviewKeyDown(object sender, KeyEventArgs e) { if (e.Key == Key.Space) { // Disallow the space key, which doesn't raise a PreviewTextInput event. e.Handled = true; } } } </code></pre> <p>Here is how to use it (replace "controls" with your own namespace):</p> <pre><code>&lt;TextBox controls:TextBoxService.IsNumericOnly="True" /&gt; </code></pre>
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    1. COI'll try that. I imagine that I can virtually add anything like that. For example, the maximum length of the text inside, which is also another problem I had.
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      1. USDavid Brunelle
    2. COForgot to mention, it's the max length of a floating number (the maximum number of decimal and max number of the integer part )
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    3. COYes, attached properties are very powerful and allowed you to add all types of behaviors.
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