How to fetch SFTP path in filestream when decrypting on the client side, whether it is possible

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C#

Iam using Renci.SshNet dll for uploading file to sftp server.

xlsx file is perfectly uploading . before uploading a file i am encrypting a file and uplading to specified path, it works perfect.

Now when iam trying to decrypt the file directly in client side(SFTP Path), it refers local path, not referring client path, even though i am specifying SFTP path.

kindly provide me solution.

NOTE: My aim is to encrypt file in my local and decrypt sample file in client side

Below is main function for Encrypt, upload, Decrypt

using (SftpClient client = new SftpClient(sftpHost, sftpPort, sftpUserName, sftpPassword))
       {
         EncryptFile(@"D:\ren.xlsx", @"D:\ren_encrypt.xlsx"); //Encryption process
         upload(client, @"\Upload", @"D:\ren_encrypt.xlsx"); // Uploading process
         client.Connect();
         if (client.Exists(@"\Upload\ren_encrypt.xlsx"))//Checking file exist in sftp path
           {
            DecryptFile(@"\Upload\ren_encrypt.xlsx", @"\Upload\ren_decrypt.xlsx");
            client.Disconnect();
           }
        }

Below code is Encryption code:

private void EncryptFile(string inputFile, string outputFile)
        {

            try
            {
                string password = @"myKey123"; //   Key Here
                UnicodeEncoding UE = new UnicodeEncoding();
                byte[] key = UE.GetBytes(password);
                string cryptFile = outputFile;
                FileStream fsCrypt = new FileStream(cryptFile, FileMode.Create);
                RijndaelManaged RMCrypto = new RijndaelManaged();
                CryptoStream cs = new CryptoStream(fsCrypt, RMCrypto.CreateEncryptor(key, key), CryptoStreamMode.Write);
                FileStream fsIn = new FileStream(inputFile, FileMode.Open);
                int data;
                while ((data = fsIn.ReadByte()) != -1)
                    cs.WriteByte((byte)data);
                fsIn.Close();
                cs.Close();
                fsCrypt.Close();
            }
            catch
            {
                MessageBox.Show("Encryption failed!", "Error");
            }
        }

Below code is upload code:

public void upload(SftpClient client, string destinationpath, string sourcefile)
       {
           try
           {
               client.Connect();
               client.ChangeDirectory(destinationpath);
               using (FileStream fs = new FileStream(sourcefile, FileMode.Open))
               {
                   client.BufferSize = 4 * 1024;
                   if (client.Exists(Path.GetFileName(sourcefile)))
                   {
                       client.DeleteFile(Path.GetFileName(sourcefile));
                   }
                   client.UploadFile(fs, Path.GetFileName(sourcefile));
                   client.Disconnect();
               }

           }
           catch (Exception ex)
           {
               MessageBox.Show(ex.Message);
           }
       }

Below code is for Decrypt, Here come our failure process

 private void DecryptFile(string inputFile, string outputFile)
        {

            try
            {
                string scheck = Path.GetFileName(inputFile);
                     string password = @"myKey123"; //   Key Here
                UnicodeEncoding UE = new UnicodeEncoding();
                byte[] key = UE.GetBytes(password);
                FileStream fsCrypt = new FileStream(inputFile, FileMode.Open);

// Here in inputfile parameter what iam passing is "\Upload\ren_encrypt.xlsx" (SFTP Path) but, it throws an error as "Could not find a part of the path 'D:\Upload\ren_encrypt.xlsx'."  I couldnt understand why it is searching in my local drive instead of SFTP server which i have provided correct sftp path

                RijndaelManaged RMCrypto = new RijndaelManaged();
                CryptoStream cs = new CryptoStream(fsCrypt, RMCrypto.CreateDecryptor(key, key), CryptoStreamMode.Read);
                FileStream fsOut = new FileStream(outputFile, FileMode.Create);
                int data;
                while ((data = cs.ReadByte()) != -1)
                    fsOut.WriteByte((byte)data);
                fsOut.Close();
                cs.Close();
                fsCrypt.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

kindly solve my issue.

What I have tried:

Below code is for Decrypt, Here come our failure process

 private void DecryptFile(string inputFile, string outputFile)
        {

            try
            {
                string scheck = Path.GetFileName(inputFile);
                     string password = @"myKey123"; //   Key Here
                UnicodeEncoding UE = new UnicodeEncoding();
                byte[] key = UE.GetBytes(password);
                FileStream fsCrypt = new FileStream(inputFile, FileMode.Open);

// Here in inputfile parameter what iam passing is "\Upload\ren_encrypt.xlsx" (SFTP Path) but, it throws an error as "Could not find a part of the path 'D:\Upload\ren_encrypt.xlsx'."  I couldnt understand why it is searching in my local drive instead of SFTP server which i have provided correct sftp path

                RijndaelManaged RMCrypto = new RijndaelManaged();
                CryptoStream cs = new CryptoStream(fsCrypt, RMCrypto.CreateDecryptor(key, key), CryptoStreamMode.Read);
                FileStream fsOut = new FileStream(outputFile, FileMode.Create);
                int data;
                while ((data = cs.ReadByte()) != -1)
                    fsOut.WriteByte((byte)data);
                fsOut.Close();
                cs.Close();
                fsCrypt.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }