Add ToPascalCase since ToTitleCase loses middle casing

Author: mythz

src/ServiceStack.Text/StringExtensions.cs

@@ -562,7 +562,7 @@ public static string StripMarkdownMarkup(this string markdown)
         private const int LowerCaseOffset = 'a' - 'A';
         public static string ToCamelCase(this string value)
         {
-            if (String.IsNullOrEmpty(value)) return value;
+            if (string.IsNullOrEmpty(value)) return value;
 
             var len = value.Length;
             var newValue = new char[len];
@@ -586,6 +586,13 @@ public static string ToCamelCase(this string value)
             return new string(newValue);
         }
 
+        public static string ToPascalCase(this string value)
+        {
+            if (string.IsNullOrEmpty(value) || value.Length <= 1) return value;
+            var camelCase = value.ToCamelCase();
+            return Char.ToUpper(camelCase[0]) + camelCase.Substring(1);
+        }
+
         public static string ToTitleCase(this string value)
         {
             return PclExport.Instance.ToTitleCase(value);