I am fairly new to WPFs... I was trying to bind a validation to a text box in WPF.
Here is my text box in the xaml:
<TextBox>
<TextBox.Text>
<Binding Source="{x:Static r:Settings.Default}" Path="ServerIP" UpdateSourceTrigger="PropertyChanged">
<Binding.ValidationRules>
<utilities:PingValidationRule />
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
Here is my validation class:
public class PingValidationRule : ValidationRule
{
public override ValidationResult Validate(object value, System.Globalization.CultureInfo cultureInfo)
{
...
if (ipCorrect) return new ValidationResult(true, null);
else return new ValidationResult(false, "It's not an IP");
}
}
With this I have the following error:
Error The namespace prefix "utilities" is not defined.
Anyone knows why?
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