VBoxManage.exe : The term 'VBoxManage.exe' is not recognized as the name of a cmdlet, function, script file, or
operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try
again.
At line:1 char:1
+ VBoxManage.exe modifyvm "my mac" --cpuidset 00000001 000106e5 0010080 ...
+ ~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (VBoxManage.exe:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

        /// <summary>
        /// (Syntactic Sugar) Checks if the given value is among a list of values or not.
        /// </summary>
        /// <remarks>
        /// This method is for syntactic sugar. What it actually does is to allow developers to wrtie a code like this
        /// <code>
        /// xVariable.IsIn(MyEnum.Value1,MyEnum.Value2)
        /// </code>
        /// Instead of these codes:
        /// <code>
        /// new []{ MyEnum.Value1, MyEnum.Value2 }.Contains(xVariable);
        /// </code>
        /// Or more commonly:
        /// <code>
        /// xVariable == MyEnum.Value1 || xVariable == MyEnum.Value2
        /// </code>
        /// </remarks>
        /// <typeparam name="T"></typeparam>
        /// <param name="source"></param>
        /// <param name="list"></param>
        /// <returns></returns>
        public static bool IsIn<T>(this T source, params T[] list)
        {
            Func<T, T, bool> compare = (v1, v2) => EqualityComparer<T>.Default.Equals(v1, v2);
            return list.Any(item => compare(item, source));
        }

//binds to onchange event of your input field
$('#myFile').bind('change', function() {

  //this.files[0].size gets the size of your file.
  alert(this.files[0].size);

});