public static class IEnumerableExt
{
    /// <summary>
    /// Wraps this object instance into an IEnumerable&lt;T&gt;
    /// consisting of a single item.
    /// </summary>
    /// <typeparam name="T"> Type of the object. </typeparam>
    /// <param name="item"> The instance that will be wrapped. </param>
    /// <returns> An IEnumerable&lt;T&gt; consisting of a single item. </returns>
    public static IEnumerable<T> Yield<T>(this T item)
    {
        yield return item;
    }
}

new T[] { item }
// or
new [] { item }

public static IEnumerable<T> ToEnumerable<T>(params T[] items)
{
    return items;
}  

/// <summary>
/// Returns the input string with the first character converted to uppercase
/// </summary>
public static string FirstLetterToUpperCase(this string s)
{
        if (string.IsNullOrEmpty(s))
                throw new ArgumentException("There is no first letter");

        char[] a = s.ToCharArray();
        a[0] = char.ToUpper(a[0]);
        return new string(a);
}

public static string GetDescription<T>(this T source)
{
    FieldInfo fi = source.GetType().GetField(source.ToString());

    DescriptionAttribute[] attributes = (DescriptionAttribute[])fi.GetCustomAttributes(
        typeof(DescriptionAttribute), false);

    if (attributes != null && attributes.Length > 0) 
        return attributes[0].Description;
    else 
        return source.ToString();
}

// In Enums.NET you'd use:

string description = ((MyEnum)value).AsString(EnumFormat.Description);