Code Gate: C# Snippets

"Remember Me" for login ( Using cache) :

In Login Button click event :

if (chkRemLoginID.Checked == true)
{
HttpCookie myCookie = new HttpCookie("myCookie ");
Response.Cookies.Remove("myCookie");
Response.Cookies.Add(myCookie);
myCookie.Values.Add("txtUserName", txtUserName.Text);
myCookie.Values.Add("txtPassword", txtPassword.Text);
myCookie.Values.Add("orgId", user.OrganizationDetails.Organizationid.ToString());
myCookie.Expires = DateTime.Now.AddDays(30);
}

In Page_Load event :

if (!IsPostBack)
{
if (HttpContext.Current.Request.Cookies["myCookie"] != null)
{
txtUserName.Text = HttpContext.Current.Request.Cookies["myCookie"] ["txtUserName"].ToString();
txtPassword.Text = HttpContext.Current.Request.Cookies["myCookie"]["txtPassword"].ToString();
txtPassword.Attributes.Add("value", txtPassword.Text);
}
}

Javascript Alert message box using C# :

public static void ShowAlertMessage(string message)
{
Page page = HttpContext.Current.Handler as Page;
if (page != null)
{
message = message.Replace("'", "\'");
System.Web.UI.ScriptManager.RegisterStartupScript(page, page.GetType(), "err_msg", "alert('" + message + "');", true);
}
}

Setting Thread for Culture info:

Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");

Open Word Document on click or on load:

Response.Clear();
Response.ContentType = "application/vnd.openxmlformats";
Response.AddHeader("Content-Disposition", "attachment; filename=" + "<DocName>");

string path = HttpContext.Current.Request.PhysicalApplicationPath + @"\Documents\<DocName>";

using (FileStream fs = File.OpenRead(path))
{
byte[] b = new byte[fs.Length];

if (fs.Read(b, 0, b.Length) >0)
Response.OutputStream.Write(b, 0, b.Length);
}
Response.End();

Reading from XML:

XmlDocument xDoc = new XmlDocument();

matchdata = drSubscription["MatchData"].ToString() // Get the xml doc

xDoc.LoadXml(matchdata);

if (xDoc.DocumentElement.ChildNodes[0].InnerText != null)

objReportSchedule.StartTime = Convert.ToDateTime(xDoc.DocumentElement.ChildNodes[0].InnerText).ToShortDateString(); // Start Reading

Base64 Encryption Class:

public static class Encryption

{

public static string Encode(string str)

{

byte[] encbuff = System.Text.Encoding.UTF8.GetBytes(str);

return Convert.ToBase64String(encbuff);

}

public static string Decode(string str)

{

byte[] decbuff = Convert.FromBase64String(str);

return System.Text.Encoding.UTF8.GetString(decbuff);

}

To check whether the file exists on FTP :

private static bool FtpDirectoryExists(string directory, string username, string password)
{
try
{
var request = (FtpWebRequest)WebRequest.Create(directory);
request.Credentials = new NetworkCredential(username, password);
request.Method = WebRequestMethods.Ftp.ListDirectory;

FtpWebResponse response = (FtpWebResponse)request.GetResponse();
}
catch (WebException ex)
{
FtpWebResponse response = (FtpWebResponse)ex.Response;
if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)
return false;
else
return true;
}
return true;

}

Code to Move/Rename file from FTP:

-- To Rename or Move the file on FTP location

public void Main()
{
//Creating directory
if (!FtpDirectoryExists(@<FTPLocationDrive>, <FTPUserName>, <FTPPassword>)
{
var reqFolder = (FtpWebRequest)WebRequest.Create(@<FTPLocationDrive>);
reqFolder.Credentials = new NetworkCredential(<FTPUserName>, <FTPPassword>);
reqFolder.Method = WebRequestMethods.Ftp.MakeDirectory;
//reqFolder.Method = WebRequestMethods.Ftp.ListDirectory;

using (var resp = (FtpWebResponse)reqFolder.GetResponse())
{
Console.WriteLine(resp.StatusCode);
}
}
var req = (FtpWebRequest)WebRequest.Create(@<FTPLocationDrive>);
req.Proxy = null;
req.Credentials = new NetworkCredential(<FTPUserName>, <FTPPassword>);
req.Method = WebRequestMethods.Ftp.Rename;

req.RenameTo = "Archive3/CO1203Y.txt";
req.GetResponse().Close();
// TODO: Add your code here
Dts.TaskResult = (int)ScriptResults.Success;
}

Compress/Decompress a file using C#:

public static void Compress(FileInfo fi)
{
// Get the stream of the source file.
using (FileStream inFile = fi.OpenRead())
{
// Prevent compressing hidden and
// already compressed files.
if ((File.GetAttributes(fi.FullName)
& FileAttributes.Hidden)
!= FileAttributes.Hidden & fi.Extension != ".gz")
{
// Create the compressed file.
using (FileStream outFile =
File.Create(fi.FullName + ".gz"))
{
using (GZipStream Compress =
new GZipStream(outFile,
CompressionMode.Compress))
{
// Copy the source file into
// the compression stream.
inFile.CopyTo(Compress);

Console.WriteLine("Compressed {0} from {1} to {2} bytes.",
fi.Name, fi.Length.ToString(), outFile.Length.ToString());
}
}
}
}
}

public static void Decompress(FileInfo fi)
{
// Get the stream of the source file.
using (FileStream inFile = fi.OpenRead())
{
// Get original file extension, for example
// "doc" from report.doc.gz.
string curFile = fi.FullName;
string origName = curFile.Remove(curFile.Length -
fi.Extension.Length);

//Create the decompressed file.
using (FileStream outFile = File.Create(origName))
{
using (GZipStream Decompress = new GZipStream(inFile,
CompressionMode.Decompress))
{
// Copy the decompression stream
// into the output file.
Decompress.CopyTo(outFile);

Console.WriteLine("Decompressed: {0}", fi.Name);
}
}
}
}

// Path to directory of files to compress and decompress.
public static string dirpath = @"E:\MyLab\ZipTest";
DirectoryInfo di = new DirectoryInfo(dirpath);

protected void btnZip_Click(object sender, EventArgs e)
{

// Compress the directory's files.
foreach (FileInfo fi in di.GetFiles())
{
Compress(fi);
}
}

protected void btnUnZip_Click(object sender, EventArgs e)
{
// Decompress all *.gz files in the directory.
foreach (FileInfo fi in di.GetFiles("*.gz"))
{
Decompress(fi);
}
}

Namespaces Used :

using System.IO;
using System.IO.Compression;

Contents

C# Snippets

Base64 Encryption Class: