Create Zip File Using Dotnet

in the dotnet framework there are two method for compressing data

1) GZip


here i am using GZip Stream (System.IO.Compression).


1) Create Simple Web Application ( with C#).

2) put below control in to page.

2.1) Button (id=”btnCompress”)

3) put below code in to click event of button.

//create one folder in the project (txt)
//get the folder physical path
string filepath = Server.MapPath("txt");
//create file
StreamWriter sw = new StreamWriter(filepath + @"\1.txt");
sw.WriteLine("we compress this file after few min.");
//open 1.txt file
FileStream objFile = File.OpenRead(filepath + @"\" + "1.txt");
//create zip file
FileStream objZipFile = File.Create(filepath + @"\zip.gz");
//this is compress stream
System.IO.Compression.GZipStream objGZip = new System.IO.Compression.GZipStream(objZipFile, CompressionMode.Compress);
//Read Bytes From Destination File
int bytes = objFile.ReadByte();
while (bytes != -1)
  //write byte in Compress File
   bytes = objFile.ReadByte();



  1. saravanan · · Reply


    I tried this code. I included the using directive “using System.IO.Compression;”. but the StreamWriter is not coming in the intellisense list. Though i compiled, it gives the obvious error “The type or namespace name ‘StreamWriter’ could not be found (are you missing a using directive or an assembly reference?) “. Pls help.

  2. hi saravanan,
    add below name space.
    //add namespace
    using System.IO;
    using System.IO.Compression;

  3. I find this link was working fine… Gzip C#

  4. Wavare SAntosh · · Reply

    It work man…………
    U need to add namespace on top.
    using System.IO.Compression;

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