Problem to convert doc to docx in c#

Hi , I want to convert doc to docx with Aspose.Word but it dosnt work , could u help me plz

public static byte[] ConvertDocToDocx(byte[] docContent)
{
    byte[] contentDocx = null;

    using (MemoryStream memoryStream = new MemoryStream(docContent))
    {
        Document doc1 = new Document(memoryStream);
        doc1.Save(memoryStream, SaveFormat.Docx);
        memoryStream.Position = 0;
        contentDocx = memoryStream.ToArray();
    }
    return contentDocx;
}

Problem to convert doc to docx in c# plz answer me

Hi Faezeh,

Thanks for your inquiry. Please use the following code to fix this issue:

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            byte[] docBytes = File.ReadAllBytes("d:\\temp\\1.doc");
            byte[] contentdocX = ConvertDocToDocx(docBytes);
            File.WriteAllBytes("d:\\temp\\1.docx", contentdocX);
        }
        public static byte[] ConvertDocToDocx(byte[] docContent)
        {
            byte[] contentDocx = null;
            using (MemoryStream memoryStream = new MemoryStream(docContent))
            {
                Document doc1 = new Document(memoryStream);
                using (MemoryStream stream = new MemoryStream())
                {
                    doc1.Save(stream, SaveFormat.Docx);
                    contentDocx = stream.ToArray();
                }
            }
            return contentDocx;
        }
    }
}

I hope, this helps.

Best regards,