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POwpf - validation - how to show tooltips and disable "run" button
 

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    <p>Hi I need to validate some of textboxes in my application. I decied to use validation rule "DataErrorValidationRule". That's why in my class I implemented IDataErrorInfo interface and wrote aproperiate functions. In my xaml code I added bindings and validation rules to textboxes</p> <pre><code> &lt;TextBox x:Name="txtName" Grid.Column="3" Grid.Row="1" TextAlignment="Center" &gt; &lt;TextBox.Text&gt; &lt;Binding Path="Name" &gt; &lt;Binding.ValidationRules&gt; &lt;DataErrorValidationRule&gt;&lt;/DataErrorValidationRule&gt; &lt;/Binding.ValidationRules&gt; &lt;/Binding&gt; &lt;/TextBox.Text&gt; &lt;/TextBox&gt; </code></pre> <p>Validation of this textbox is OK - I mean red frame appears on textbox if data is wrong. However what I need to do is to show tooltip on that textbox, but what is more important I have to disable button "Run" if any textboxes have wrong data. What is the best way to do taht ??</p> <p>EDIT First problem was solved, but I have an another. I need to use MultiBindings to validate my Button. So I did sth like that</p> <pre><code> &lt;Button x:Name="btnArrange" Grid.Column="0" Content="Rozmieść" Click="btnArrange_Click" &gt; &lt;Button.Style&gt; &lt;Style TargetType="Button"&gt; &lt;Style.Triggers&gt; &lt;DataTrigger Value="False"&gt; &lt;DataTrigger.Binding&gt; &lt;MultiBinding Converter="{StaticResource BindingConverter}"&gt; &lt;Binding ElementName="txtName" Path="Validation.HasError" /&gt; &lt;Binding ElementName="txtSurname" Path="Validation.HasError"/&gt; &lt;Binding ElementName="txtAddress" Path="Validation.HasError"/&gt; &lt;/MultiBinding&gt; &lt;/DataTrigger.Binding&gt; &lt;Setter Property="IsEnabled" Value="False"/&gt; &lt;/DataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/Button.Style&gt; &lt;/Button&gt; </code></pre> <p>My Converter looks like that</p> <pre><code> public class Converters : IMultiValueConverter { #region IMultiValueConverter Members public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if(values !=null &amp;&amp; values.Length &gt; 0) { if (values.Cast&lt;type&gt;().Count(val =&gt; val) &gt; 0) return false; return true; } return false; } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture) { return null; } #endregion } </code></pre> <p>However I get invalidCastException in this converter. What is a proper cast in that case? I thoght as if HasError is a bool type so I should cast to bool.</p>
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