IntLibrary.cs

using System;

namespace CSharpLibrary
{
    public static class IntLibrary
    {
        public static bool NumberGreaterThan5(this string value)
        {
            Int32 intValue = 0;
            bool canConvert = Int32.TryParse(value, out intValue);

            if (canConvert)
            {
                if (intValue > 5)
                {
                    return true;
                }
            }

            return false;
        }
    }
}