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    class Blubb
    {
        public string Foo;
    }


    class Program
    {
        static void Main(string[] args)
        {
            var b = new Blubb();

            SetField(b, "Foo", "Bar");

            Console.WriteLine(b.Foo);
            Console.ReadLine();
        }

        static void SetField(object o, string field, string value)
        {
            var t = o.GetType();

            var fieldInfo = t.GetField(field);
            if (fieldInfo == null)
                throw new Exception("Feld jibbet nisch");

            fieldInfo.SetValue(o, value);
        }
    }