Sort a List and keep a particular element at end of list after sorting

I have a list of string containing "Others". I am getting this list for drop down. I am sorting this list alphabetically. But I need "Others" always at end of list. I don't want to add this element after sorting which is one solution. Is there any other way to do the same like by using custom comparer of .Sort() method. I tried like below but no solution.

 public class EOComparer : IComparer<string>
    {
        public int Compare(string x, string y)
        {
            if (x == null)
            {
                if (y == null)
                {
                    // If x is null and y is null, they're
                    // equal. 
                    return 0;
                }
                else
                {
                    // If x is null and y is not null, y
                    // is greater. 
                    return -1;
                }
            }
            else
            {
                // If x is not null...
                //
                if (y == null)
                // ...and y is null, x is greater.
                {
                    return 1;
                }
                else
                {
                    if (x.ToLower().Contains("other"))
                    {
                        return -1;
                    }
                    else
                    {
                        // If the strings are of equal length,
                        // sort them with ordinary string comparison.
                        //
                        return x.CompareTo(y);
                    }
                }
            }
        }

and calling it as :

EOComparer c = new EOComparer();
a.Sort((x, y) => c.Compare(x.OptionValue, y.OptionValue));
             return a;

Please help if it is possible.