Frequently Used Extension Methods

DateTimeExt.cs

namespace System
{
    public static class DateTimeExt
    {
        public static DateTime ToUnspecified(this DateTime dt)
        {
            return DateTime.SpecifyKind(dt, DateTimeKind.Unspecified);
        }
    }
}

DoubleExt.cs

namespace System
{
    public static class DoubleExt
    {
        public static bool IsZero(this double input)
        {
            return Math.Abs(0 - input) < Double.Epsilon;
        }
    }
}

StringExt.cs

namespace System
{
    public static class StringExt
    {
        public static bool EqualsWithCaseIgnore(this string a, string b)
        {
            return string.Equals(a.Trim(), b.Trim(), StringComparison.OrdinalIgnoreCase);
        }

        public static T As<T>(this string str)
        {
            if (string.IsNullOrWhiteSpace(str) && Nullable.GetUnderlyingType(typeof(T)) != null)
                return default(T);

            return (T)Convert.ChangeType(str, typeof(T));
        }
    }
}