Created converters to show valid and invalid inputs.

osrs-toolbox/Converters/DoubleTextBackgroundConverter.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 osrs_toolbox
+{
+    public class DoubleTextBackgroundConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            string Value = value as string;
+            if (string.IsNullOrEmpty(Value)) return new SolidColorBrush(Colors.Aquamarine);
+            else
+            {
+                try
+                {
+                    System.Convert.ToDouble(Value);
+                    return new SolidColorBrush(Colors.White);
+                }
+                catch
+                {
+                    return new SolidColorBrush(Colors.Red);
+                }
+            }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

osrs-toolbox/Converters/IntTextBackgroundConverter.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 osrs_toolbox
+{
+    public class IntTextBackgroundConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            string Value = value as string;
+            if (string.IsNullOrEmpty(Value)) return new SolidColorBrush(Colors.Aquamarine);
+            else
+            {
+                try
+                {
+                    System.Convert.ToInt32(Value);
+                    return new SolidColorBrush(Colors.White);
+                }
+                catch
+                {
+                    return new SolidColorBrush(Colors.Red);
+                }
+            }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}