C# - String array to CSV Line

FieldsToLine.cs

public static string FieldsToLine(string[] fields)
{
    if (fields == null || fields.Length <= 0)
        return string.Empty;

    string line = string.Empty;
    foreach (var field in fields)
    {
        string convertedField = field;

        if (convertedField.Contains("\""))
            convertedField = convertedField.Replace("\"", "\"\"");

        if (convertedField.Contains(",") || convertedField.Contains("\\n"))
            convertedField = String.Format("\"{0}\"", convertedField);

        line += convertedField + ",";
    }

    return line.Remove(line.Length - 1);
}