Project cannot be opened because its project type (.csproj) is not supported by this version of the application.

To open this project, please use a version that supports this type of project.

Follow the below steps to resolve the above error.
Click Start> All Programs > Visual Studio 2008 > Visual Studio Tools > Click Visual Studio 2008 Command Prompt. Type the below command and press enter.

"devenv.exe /resetskippkgs"

Executing this command should solve your problem.

How to zip & extract files

 You can use this ZipManager class for zipping files & unzipping.


using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Net;
using System.IO;
using ICSharpCode.SharpZipLib.Zip;

namespace WebApplication1.Compress
{
    public class ZipManager
    {
        private static void ZipFiles(string inputFolderPath, string outputPathAndFile, string password)
        {
            ArrayList ar = GenerateFileList(inputFolderPath); // generate file list
            int TrimLength = (Directory.GetParent(inputFolderPath)).ToString().Length;
            // find number of chars to remove     // from orginal file path
            TrimLength += 1; //remove '\'
            FileStream ostream;
            byte[] obuffer;
            string outPath = inputFolderPath + @"\" + outputPathAndFile;
            ZipOutputStream oZipStream = new ZipOutputStream(File.Create(outPath)); // create zip stream
            if (password != null && password != String.Empty)
                oZipStream.Password = password;
            oZipStream.SetLevel(9); // maximum compression
            ZipEntry oZipEntry;
            foreach (string Fil in ar) // for each file, generate a zipentry
            {
                oZipEntry = new ZipEntry(Fil.Remove(0, TrimLength));
                oZipStream.PutNextEntry(oZipEntry);

                if (!Fil.EndsWith(@"/")) // if a file ends with '/' its a directory
                {
                    ostream = File.OpenRead(Fil);
                    obuffer = new byte[ostream.Length];
                    ostream.Read(obuffer, 0, obuffer.Length);
                    oZipStream.Write(obuffer, 0, obuffer.Length);
                }
            }
            oZipStream.Finish();
            oZipStream.Close();
        }//code for zipping files


        private static ArrayList GenerateFileList(string Dir)
        {
            ArrayList fils = new ArrayList();
            bool Empty = true;
            foreach (string file in Directory.GetFiles(Dir)) // add each file in directory
            {
                fils.Add(file);
                Empty = false;
            }

            if (Empty)
            {
                if (Directory.GetDirectories(Dir).Length == 0)
                // if directory is completely empty, add it
                {
                    fils.Add(Dir + @"/");
                }
            }

            foreach (string dirs in Directory.GetDirectories(Dir)) // recursive
            {
                foreach (object obj in GenerateFileList(dirs))
                {
                    fils.Add(obj);
                }
            }
            return fils; // return file list
        }//to get folder files

        private void UnZipFiles(Stream stream, string outputFolder)
        {
            //ZipInputStream s = new ZipInputStream(File.OpenRead(zipPathAndFile));
            ZipInputStream s = new ZipInputStream(stream);

            ZipEntry theEntry;
            string tmpEntry = String.Empty;
            while ((theEntry = s.GetNextEntry()) != null)
            {
                string directoryName = outputFolder;
                string fileName = Path.GetFileName(theEntry.Name);
                // create directory
                if (directoryName != "")
                {
                    Directory.CreateDirectory(directoryName);
                }
                if (fileName != String.Empty)
                {
                    if (theEntry.Name.IndexOf(".ini") < 0)
                    {
                        string fullPath = directoryName + "\\" + theEntry.Name;
                        fullPath = fullPath.Replace("\\ ", "\\");
                        string fullDirPath = Path.GetDirectoryName(fullPath);
                        if (!Directory.Exists(fullDirPath)) Directory.CreateDirectory(fullDirPath);
                        FileStream streamWriter = File.Create(fullPath);
                        int size = 2048;
                        byte[] data = new byte[2048];
                        while (true)
                        {
                            size = s.Read(data, 0, data.Length);
                            if (size > 0)
                            {
                                streamWriter.Write(data, 0, size);
                            }
                            else
                            {
                                break;
                            }
                        }
                        streamWriter.Close();
                    }
                }
            }
            s.Close();
        }

        public static void ZipFiles(string inputFolderPath, string outputFolderPath,string filenameWithExtension, string password)
        {
            if (Directory.Exists(outputFolderPath))//if folder exists delete and recreate it
            {
                DirectoryInfo ifo = new DirectoryInfo(outputFolderPath);
                ifo.Delete(true);
            }

            Directory.CreateDirectory(outputFolderPath);// create folder for lecturer
            ZipFiles(outputFolderPath, filenameWithExtension, password);//zip the crearted folder
        }

        public static void UnZipFiles(string zipPathAndFile, string outputFolder, string password, bool deleteZipFile)
        {
            ZipInputStream s = new ZipInputStream(File.OpenRead(zipPathAndFile));
            if (password != null && password != String.Empty)
                s.Password = password;
            ZipEntry theEntry;
            string tmpEntry = String.Empty;
            while ((theEntry = s.GetNextEntry()) != null)
            {
                string directoryName = outputFolder;
                string fileName = Path.GetFileName(theEntry.Name);
                // create directory
                if (directoryName != "")
                {
                    Directory.CreateDirectory(directoryName);
                }
                if (fileName != String.Empty)
                {
                    if (theEntry.Name.IndexOf(".ini") < 0)
                    {
                        string fullPath = directoryName + "\\" + theEntry.Name;
                        fullPath = fullPath.Replace("\\ ", "\\");
                        string fullDirPath = Path.GetDirectoryName(fullPath);
                        if (!Directory.Exists(fullDirPath)) Directory.CreateDirectory(fullDirPath);
                        FileStream streamWriter = File.Create(fullPath);
                        int size = 2048;
                        byte[] data = new byte[2048];
                        while (true)
                        {
                            size = s.Read(data, 0, data.Length);
                            if (size > 0)
                            {
                                streamWriter.Write(data, 0, size);
                            }
                            else
                            {
                                break;
                            }
                        }
                        streamWriter.Close();
                    }
                }
            }
            s.Close();
            if (deleteZipFile)
                File.Delete(zipPathAndFile);
        }

       
    }
}


For Zipping you can call as shown below.
 Compress.ZipManager.ZipFiles("D:/TestFiles/", "D:/TestBackup/", "Backup1.zip", "");

For unzipping
/*unzipping files*/
Compress.ZipManager.UnZipFiles("D:/TestBackup/Control_demo.zip", "D:/TestBackup/", "sahan", false);

You have to download
ICSharpCode.SharpZipLib

How to uplaod a file to a ftp server

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Net;

namespace WebApplication1.FTP
{
    public class FTPManager
    {
        public string FtpFilePath { get; set; }
        public string FtpInputFilePath { get; set; }
        public string FtpHost { get; set; }
        public string FtpUserName { get; set; }
        public string FtpPAssword { get; set; }

        public void UploadFile(FTPManager fm)
        {
            //try
            //{
            //string ftphost = "203.143.11.98";
            //here correct hostname or IP of the ftp server to be given 

            string ftpfullpath = "ftp://" + fm.FtpHost + fm.FtpFilePath;
            FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create(ftpfullpath);
            ftp.Credentials = new NetworkCredential(fm.FtpUserName, fm.FtpPAssword);
            //userid and password for the ftp server to given 

            ftp.KeepAlive = true;
            ftp.UseBinary = true;
            ftp.Method = WebRequestMethods.Ftp.UploadFile;


            FileStream fs = File.OpenRead(fm.FtpInputFilePath);

            int buffLength = 2048;
            byte[] buff = new byte[buffLength];
            int contentLen;



            try
            {
                // Stream to which the file to be upload is written
                Stream strm = ftp.GetRequestStream();

                // Read from the file stream 2kb at a time
                contentLen = fs.Read(buff, 0, buffLength);

                // Till Stream content ends
                while (contentLen != 0)
                {
                    // Write Content from the file stream to the FTP Upload
                    // Stream
                    strm.Write(buff, 0, contentLen);
                    contentLen = fs.Read(buff, 0, buffLength);
                }

                // Close the file stream and the Request Stream
                strm.Close();
                fs.Close();


            }
            catch
            {
                throw new WebException();
            }
        }

        public void UploadFile(FTPManager fm,byte[] buffer)
        {
            try
            {
                //string ftphost = "203.143.11.98";
                //here correct hostname or IP of the ftp server to be given 

                string ftpfullpath = "ftp://" + fm.FtpHost + fm.FtpFilePath;
                FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create(ftpfullpath);
                ftp.Credentials = new NetworkCredential(fm.FtpUserName, fm.FtpPAssword);
                //userid and password for the ftp server to given 

                ftp.KeepAlive = true;
                ftp.UseBinary = true;
                ftp.Method = WebRequestMethods.Ftp.UploadFile;
                //FileStream fs = File.OpenRead(fm.FtpInputFilePath);
                //byte[] buffer = new byte[fs.Length];
                //fs.Read(buffer, 0, buffer.Length);
                //fs.Close();
                Stream ftpstream = ftp.GetRequestStream();
                ftpstream.Write(buffer, 0, buffer.Length);
                ftpstream.Close();
            }
            catch
            {
                throw new InvalidDataException();
            }
        }
    }
}


This is the way to use this class

 FTP.FTPManager fm = new FTP.FTPManager();
            fm.FtpUserName = "com";
            fm.FtpPAssword = "Com123$";
            fm.FtpInputFilePath = @"D:/from desktop 2010-06-08.zip";
            fm.FtpFilePath = @"/TestFtp/from desktop 2010-06-08.zip";
            fm.FtpHost = "203.143.11.98";

            if (FileUpload1.HasFile)
            {
                fm.FtpFilePath = @"/TestFtp/"+FileUpload1.PostedFile.FileName;
                fm.UploadFile(fm, FileUpload1.FileBytes);             
            }
            else
                fm.UploadFile(fm);

Add/Remove List box control in c#

I found a nice article on Add/Remove List box control in c#...

click Here

C# Class to Get MP3 Header Details

class MP3Header
    {
        // Public variables for storing the information about the MP3
        public int intBitRate;
        public string strFileName;
        public long lngFileSize;
        public int intFrequency;
        public string strMode;
        public int intLength;
        public string strLengthFormatted;

        // Private variables used in the process of reading in the MP3 files
        private ulong bithdr;
        private bool boolVBitRate;
        private int intVFrames;

        public bool ReadMP3Information(string FileName)
        {
            FileStream fs = new FileStream(FileName, FileMode.Open, FileAccess.Read);
            // Set the filename not including the path information
            strFileName = @fs.Name;
            char[] chrSeparators = new char[] { '\\', '/' };
            string[] strSeparator = strFileName.Split(chrSeparators);
            int intUpper = strSeparator.GetUpperBound(0);
            strFileName = strSeparator[intUpper];

            // Replace ' with '' for the SQL INSERT statement
            strFileName = strFileName.Replace("'", "''");

            // Set the file size
            lngFileSize = fs.Length;

            byte[] bytHeader = new byte[4];
            byte[] bytVBitRate = new byte[12];
            int intPos = 0;

            // Keep reading 4 bytes from the header until we know for sure that in
            // fact it's an MP3
            do
            {
                fs.Position = intPos;
                fs.Read(bytHeader, 0, 4);
                intPos++;
                LoadMP3Header(bytHeader);
            }
            while (!IsValidHeader() && (fs.Position != fs.Length));

            // If the current file stream position is equal to the length,
            // that means that we've read the entire file and it's not a valid MP3 file
            if (fs.Position != fs.Length)
            {
                intPos += 3;

                if (getVersionIndex() == 3)    // MPEG Version 1
                {
                    if (getModeIndex() == 3)    // Single Channel
                    {
                        intPos += 17;
                    }
                    else
                    {
                        intPos += 32;
                    }
                }
                else                        // MPEG Version 2.0 or 2.5
                {
                    if (getModeIndex() == 3)    // Single Channel
                    {
                        intPos += 9;
                    }
                    else
                    {
                        intPos += 17;
                    }
                }

                // Check to see if the MP3 has a variable bitrate
                fs.Position = intPos;
                fs.Read(bytVBitRate, 0, 12);
                boolVBitRate = LoadVBRHeader(bytVBitRate);

                // Once the file's read in, then assign the properties of the file to the public variables
                intBitRate = getBitrate();
                intFrequency = getFrequency();
                strMode = getMode();
                intLength = getLengthInSeconds();
                strLengthFormatted = getFormattedLength();
                fs.Close();
                return true;
            }
            return false;
        }

        private void LoadMP3Header(byte[] c)
        {
            // this thing is quite interesting, it works like the following
            // c[0] = 00000011
            // c[1] = 00001100
            // c[2] = 00110000
            // c[3] = 11000000
            // the operator << means that we'll move the bits in that direction
            // 00000011 << 24 = 00000011000000000000000000000000
            // 00001100 << 16 =         000011000000000000000000
            // 00110000 << 24 =                 0011000000000000
            // 11000000       =                         11000000
            //                +_________________________________
            //                  00000011000011000011000011000000
            bithdr = (ulong)(((c[0] & 255) << 24) | ((c[1] & 255) << 16) | ((c[2] & 255) << 8) | ((c[3] & 255)));
        }

        private bool LoadVBRHeader(byte[] inputheader)
        {
            // If it's a variable bitrate MP3, the first 4 bytes will read 'Xing'
            // since they're the ones who added variable bitrate-edness to MP3s
            if (inputheader[0] == 88 && inputheader[1] == 105 &&
                inputheader[2] == 110 && inputheader[3] == 103)
            {
                int flags = (int)(((inputheader[4] & 255) << 24) | ((inputheader[5] & 255) << 16) | ((inputheader[6] & 255) << 8) | ((inputheader[7] & 255)));
                if ((flags & 0x0001) == 1)
                {
                    intVFrames = (int)(((inputheader[8] & 255) << 24) | ((inputheader[9] & 255) << 16) | ((inputheader[10] & 255) << 8) | ((inputheader[11] & 255)));
                    return true;
                }
                else
                {
                    intVFrames = -1;
                    return true;
                }
            }
            return false;
        }

        private bool IsValidHeader()
        {
            return (((getFrameSync() & 2047) == 2047) &&
                    ((getVersionIndex() & 3) != 1) &&
                    ((getLayerIndex() & 3) != 0) &&
                    ((getBitrateIndex() & 15) != 0) &&
                    ((getBitrateIndex() & 15) != 15) &&
                    ((getFrequencyIndex() & 3) != 3) &&
                    ((getEmphasisIndex() & 3) != 2));
        }

        private int getFrameSync()
        {
            return (int)((bithdr >> 21) & 2047);
        }

        private int getVersionIndex()
        {
            return (int)((bithdr >> 19) & 3);
        }

        private int getLayerIndex()
        {
            return (int)((bithdr >> 17) & 3);
        }

        private int getProtectionBit()
        {
            return (int)((bithdr >> 16) & 1);
        }

        private int getBitrateIndex()
        {
            return (int)((bithdr >> 12) & 15);
        }

        private int getFrequencyIndex()
        {
            return (int)((bithdr >> 10) & 3);
        }

        private int getPaddingBit()
        {
            return (int)((bithdr >> 9) & 1);
        }

        private int getPrivateBit()
        {
            return (int)((bithdr >> 8) & 1);
        }

        private int getModeIndex()
        {
            return (int)((bithdr >> 6) & 3);
        }

        private int getModeExtIndex()
        {
            return (int)((bithdr >> 4) & 3);
        }

        private int getCoprightBit()
        {
            return (int)((bithdr >> 3) & 1);
        }

        private int getOrginalBit()
        {
            return (int)((bithdr >> 2) & 1);
        }

        private int getEmphasisIndex()
        {
            return (int)(bithdr & 3);
        }

        private double getVersion()
        {
            double[] table = { 2.5, 0.0, 2.0, 1.0 };
            return table[getVersionIndex()];
        }

        private int getLayer()
        {
            return (int)(4 - getLayerIndex());
        }

        private int getBitrate()
        {
            // If the file has a variable bitrate, then we return an integer average bitrate,
            // otherwise, we use a lookup table to return the bitrate
            if (boolVBitRate)
            {
                double medFrameSize = (double)lngFileSize / (double)getNumberOfFrames();
                return (int)((medFrameSize * (double)getFrequency()) / (1000.0 * ((getLayerIndex() == 3) ? 12.0 : 144.0)));
            }
            else
            {
                int[, ,] table =        {
                                { // MPEG 2 & 2.5
                                    {0,  8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160,0}, // Layer III
                                    {0,  8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160,0}, // Layer II
                                    {0, 32, 48, 56, 64, 80, 96,112,128,144,160,176,192,224,256,0}  // Layer I
                                },
                                { // MPEG 1
                                    {0, 32, 40, 48, 56, 64, 80, 96,112,128,160,192,224,256,320,0}, // Layer III
                                    {0, 32, 48, 56, 64, 80, 96,112,128,160,192,224,256,320,384,0}, // Layer II
                                    {0, 32, 64, 96,128,160,192,224,256,288,320,352,384,416,448,0}  // Layer I
                                }
                                };

                return table[getVersionIndex() & 1, getLayerIndex() - 1, getBitrateIndex()];
            }
        }

        private int getFrequency()
        {
            int[,] table =    {  
                            {32000, 16000,  8000}, // MPEG 2.5
                            {    0,     0,     0}, // reserved
                            {22050, 24000, 16000}, // MPEG 2
                            {44100, 48000, 32000}  // MPEG 1
                        };

            return table[getVersionIndex(), getFrequencyIndex()];
        }

        private string getMode()
        {
            switch (getModeIndex())
            {
                default:
                    return "Stereo";
                case 1:
                    return "Joint Stereo";
                case 2:
                    return "Dual Channel";
                case 3:
                    return "Single Channel";
            }
        }

        private int getLengthInSeconds()
        {
            // "intKilBitFileSize" made by dividing by 1000 in order to match the "Kilobits/second"
            int intKiloBitFileSize = (int)((8 * lngFileSize) / 1000);
            return (int)(intKiloBitFileSize / getBitrate());
        }

        private string getFormattedLength()
        {
            // Complete number of seconds
            int s = getLengthInSeconds();

            // Seconds to display
            int ss = s % 60;

            // Complete number of minutes
            int m = (s - ss) / 60;

            // Minutes to display
            int mm = m % 60;

            // Complete number of hours
            int h = (m - mm) / 60;

            // Make "hh:mm:ss"
            return h.ToString("D2") + ":" + mm.ToString("D2") + ":" + ss.ToString("D2");
        }

        private int getNumberOfFrames()
        {
            // Again, the number of MPEG frames is dependant on whether it's a variable bitrate MP3 or not
            if (!boolVBitRate)
            {
                double medFrameSize = (double)(((getLayerIndex() == 3) ? 12 : 144) * ((1000.0 * (float)getBitrate()) / (float)getFrequency()));
                return (int)(lngFileSize / medFrameSize);
            }
            else
                return intVFrames;
        }
    }