Simple (Very) C# Extension Method for conversion to a CSV list

ToCSV.cs

public static string ToCsv<T>(string separator, IEnumerable<T> objectlist)
    {
        Type t = typeof(T);
        FieldInfo[] fields = t.GetFields();

        string header = String.Join(separator, fields.Select(f => f.Name).ToArray());

        StringBuilder csvdata = new StringBuilder();
        csvdata.AppendLine(header);

        foreach (var o in objectlist)
        {
            csvdata.AppendLine(ToCsvFields(separator, fields, o));
	}
        return csvdata.ToString();
    }

    public static string ToCsvFields(string separator, FieldInfo[] fields, object o)
    {
        StringBuilder line = new StringBuilder();

        foreach (var f in fields)
        {
            if (line.Length > 0)
                line.Append(separator);

            var x = f.GetValue(o);

            if (x != null)
                line.Append(x.ToString());
        }

        return line.ToString();
    }