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    <p>You can put a validation in your binding</p> <pre><code>&lt;TextBox&gt; &lt;TextBox.Text&gt; &lt;Binding Path="CategoriaSeleccionada.ColorFondo" UpdateSourceTrigger="PropertyChanged"&gt; &lt;Binding.ValidationRules&gt; &lt;utilities:RGBValidationRule /&gt; &lt;/Binding.ValidationRules&gt; &lt;/Binding&gt; &lt;/TextBox.Text&gt; &lt;/TextBox&gt; </code></pre> <p>Look at this example (of my program), you put the validation inside the binding like this. With UpdateSourceTrigger you can change when you binding will be updated (lost focus, in every change...)</p> <p>Well, the validation is a class, I will put you an example:</p> <pre><code>class RGBValidationRule : ValidationRule { public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo) { // Here you make your validation using the value object. // If you want to check if the object is only numbers you can // Use some built-in method string blah = value.ToString(); int num; bool isNum = int.TryParse(blah, out num); if (isNum) return new ValidationResult(true, null); else return new ValidationResult(false, "It's no a number"); } } </code></pre> <p>In short, do the job inside that method and return a new ValidationResult. The first parameter is a bool, true if the validation is good, false if not. The second parameter is only a message for information.</p> <p>I think that this is the basics of textbox validation.</p> <p>Hope this help.</p> <p>EDIT: Sorry, I don't know VB.NET but I think that the C# code is pretty simple.</p>
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    1. USJesus Rodriguez
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    1. COI know both so it's easy for me to conver it. Thank you, I will try it soon enough.
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      1. USDavid Brunelle
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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