How to Read and view Excel file from SQL Server DB

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C#

SQL-Server-2008

Hi,

I have uploaded an Excel into the DB using C#.
Now I want to retrieve the same excel file and view as excel. To read the file from DB I have written code which saves as byte file in the path specified. But I'm unable to open the file as an excel.

Please find the code below which I have written to download the file as byte.
Kindly let me know how could I open it as an excel and view.

public void readExcelFromDB()
        {
            SqlConnection conn = new SqlConnection(@"My Connection String");
        

            conn.Open();
            SqlCommand Cmd = new SqlCommand("select ExcelSheet from Test_Excel where ExcelID = 1", conn);
            Cmd.CommandType = CommandType.Text;
            //SqlCommand Cmd = new SqlCommand("select Attachment from Requests where RequestsID = 27", conn);
            

            SqlDataReader Reader = Cmd.ExecuteReader(CommandBehavior.CloseConnection);
            //
            string DocumentName = null;
            FileStream FStream = null;
            BinaryWriter BWriter = null;
            //
            //
            //
            byte[] Binary = null;
            const int ChunkSize = 100;
            int SizeToWrite = 0;
            MemoryStream MStream = null;
            //
            while (Reader.Read())
            {
                DocumentName = Reader["ExcelSheet"].ToString();
                // Create a file to hold the output.
                FStream = new FileStream(@"D:\Mathi_Working\" + DocumentName, FileMode.OpenOrCreate, FileAccess.Write);
                BWriter = new BinaryWriter(FStream);
                Binary = (Reader["ExcelSheet"]) as byte[];
                SizeToWrite = ChunkSize;
                MStream = new MemoryStream(Binary);
                //
                for (int i = 0; i < Binary.GetUpperBound(0) - 1; i = i + ChunkSize)
                {
                    if (i + ChunkSize >= Binary.Length) SizeToWrite = Binary.Length - i;
                    byte[] Chunk = new byte[SizeToWrite];
                    MStream.Read(Chunk, 0, SizeToWrite);
                    BWriter.Write(Chunk);
                    BWriter.Flush();
                }
                BWriter.Close();
                FStream.Close();

            }
            FStream.Dispose();

            conn.Close();

            Process.Start(@"D:\Mathi_Working\" + DocumentName);
        }

Thanks & Regards,
Mathi.