binding validation & converter

PacticeSolution/BindingValidationRuleSample/Converter/ButtonTextBrush.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+using System.Windows.Media;
+
+namespace BindingValidationRuleSample.Converter
+{
+    [ValueConversion(typeof(int), typeof(Brush))]
+    internal class ButtonTextBrush : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (targetType != typeof(Brush))
+                return null;
+
+            if (value == null)
+                return null;
+
+            int age = int.Parse(value.ToString());
+            return ValueColor(age);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return null;
+        }
+
+        private Brush ValueColor(int age)
+        {
+            if (age >= 10 && age < 20)
+                return Brushes.HotPink;
+
+            if (age >= 20 && age < 30)
+                return Brushes.DarkOliveGreen;
+
+            return Brushes.MediumPurple;
+        }
+    }
+}