public ValidationMessage(string message)
{
ArgumentCheck.IsNotNull(message, "message");
ArgumentCheck.IsNotEmpty(message, "message");
Message = message;
}
/// <summary>
/// Initializes a new instance of the <see cref="ExcelSpreadsheet"/> class.
/// </summary>
/// <param name="filename">The filename.</param>
private ExcelSpreadsheet(string filename)
{
ArgumentCheck.IsNotNull(filename);
ArgumentCheck.IsNotEmpty(filename);
FileInfo fileInfo = new FileInfo(filename);
existingFile = fileInfo.Exists;
this.filename = filename;
workbook = existingFile ? new XLWorkbook(filename) : new XLWorkbook();
disposed = false;
}