Asp.Net Programming: C#

Showing posts with label C#. Show all posts

Tuesday, 19 March 2013

How To Use Digital Signature in Asp.net

How To Use Digital Signature in Asp.net

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections;
using System.Security.Cryptography;
using System.Security.Permissions;
using System.Security.Cryptography.X509Certificates;
using System.IO;
using System.Text;

public partial class FMS_x509test : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
test();

}
public void test()
{

X509Store store = new X509Store("MY", StoreLocation.CurrentUser);
store.Open(OpenFlags.OpenExistingOnly | OpenFlags.ReadWrite);
//Put certificates from the store into a collection so user can select one.
X509Certificate2Collection fcollection = (X509Certificate2Collection)store.Certificates;
X509Certificate2Collection collection = X509Certificate2UI.SelectFromCollection(fcollection, "Select an X509 Certificate", "Choose a certificate to examine.", X509SelectionFlag.SingleSelection);

X509Certificate2 certificate = collection[0];
// X509Certificate2UI.DisplayCertificate(certificate);
RSACryptoServiceProvider csp = null;
csp = (RSACryptoServiceProvider)certificate.PrivateKey;
// Hash the data
SHA1Managed sha1 = new SHA1Managed();
UnicodeEncoding encoding = new UnicodeEncoding();
byte[] data = encoding.GetBytes("Lokesh");
byte[] hash = sha1.ComputeHash(data);
byte[] signature = csp.SignHash(hash, CryptoConfig.MapNameToOID("SHA1"));

//Verification Code


RSACryptoServiceProvider csp1 = (RSACryptoServiceProvider)certificate.PublicKey.Key;

// Hash the data
SHA1Managed sha11 = new SHA1Managed();
UnicodeEncoding encoding1 = new UnicodeEncoding();
byte[] data1 = encoding.GetBytes("Lokesh");
byte[] hash1 = sha1.ComputeHash(data1);

// Verify the signature with the hash
if (csp1.VerifyHash(hash1, CryptoConfig.MapNameToOID("SHA1"), signature))
{
Response.Write("<script language=javascript> alert('correct');</script/>");
}
else
{
Response.Write("<script language=javascript> alert('No correct');</script/>");
}

// Sign text

// byte[] signature = Sign("Test", "cn=Dashputre Jaideep JYD");
}
}

Wednesday, 13 March 2013

Get Current Page Name in Asp.Net

Here I will explain How toGet Current page name in Asp.Net using C# and Vb.Net

C# Code

public static string GetCurrentPageName()
    {
        string sPath = System.Web.HttpContext.Current.Request.Url.AbsolutePath;
        System.IO.FileInfo oInfo = new System.IO.FileInfo(sPath);
        string sRet = oInfo.Name;
        return sRet;
    }

Vb.Net

    Public Shared Function GetCurrentPageName() As String
        Dim sPath As String = System.Web.HttpContext.Current.Request.Url.AbsolutePath
        Dim oInfo As System.IO.FileInfo = New System.IO.FileInfo(sPath)
        Dim sRet As String = oInfo.Name
        Return sRet
    End Function

Check Internet Connection in Asp.net

We can check internet connectivity of system by downloading data of a website from server for that code like as shown below.

<head>

<title>Check Internet Connection Availability using Asp.net</title>

</head>

<body>

<div>

<asp:Button runat="server" ID="btnCheck" Text="Check Internet Connectivity" OnClick="btnCheck_Click"/>

<asp:Label runat="server" ID="lbltxt" />

</div>

</form>

</body>

</html>

C# Code

using System;

using System.Net;

protected void btnCheck_Click(object sender, EventArgs e)

{

WebClient client = new WebClient();

byte[] datasize = null;

try

{

datasize = client.DownloadData("http://www.google.com");

}

catch (Exception ex)

{

}

if (datasize != null && datasize.Length > 0)

lbltxt.Text = "Internet Connection Available.";

else

lbltxt.Text = "Internet Connection Not Available.";

}

Vb.Net

Imports System.Net

Partial Class VBCode

Inherits System.Web.UI.Page

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

End Sub

Protected Sub btnCheck_Click(ByVal sender As Object, ByVal e As EventArgs)

Dim client As New WebClient()

Dim datasize As Byte() = Nothing

Try

datasize = client.DownloadData("http://www.google.com")

Catch ex As Exception

End Try

If datasize IsNot Nothing AndAlso datasize.Length > 0 Then

lbltxt.Text = "Internet Connection Available."

Else

lbltxt.Text = "Internet Connection Not Available."

End If

End Sub

End Class

Friday, 8 March 2013

How to upload/download file from FTP Server in Asp.net

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.IO;

using System.Net;

public partial class Default2 : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

// Upload file

protected void btnUpload_Click(object sender, EventArgs e)

{

//fileName = Name of the file to be downloaded from FTP server.

string fileName = "test.txt";

//filePath = The full path where the file is to be created. Here i put local system path.

string filePath = "C:\\FTP";

string ftpServerIP = "IP Address";

string ftpUserID = "User ID";

string ftpPassword = "Password";

FtpWebRequest reqFTP;

try

{

FileStream outputStream = new FileStream(filePath + "\\"+ fileName, FileMode.Create);

reqFTP = (FtpWebRequest)FtpWebRequest.Create(newUri("ftp://" + ftpServerIP + "/" + fileName));

reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;

reqFTP.UseBinary = true;

reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();

Stream ftpStream = response.GetResponseStream();

long cl = response.ContentLength;

int bufferSize = 2048;

int readCount;

byte[] buffer = new byte[bufferSize];

readCount = ftpStream.Read(buffer, 0, bufferSize);

while (readCount > 0)

{

outputStream.Write(buffer, 0, readCount);

readCount = ftpStream.Read(buffer, 0, bufferSize);

}

ftpStream.Close();

outputStream.Close();

response.Close();

}

catch (Exception ex)

{

string errMsg = (ex.Message);

}

// Download file

protected void btnDownload_Click(object sender, EventArgs e)

{

string filename = "c:\\test.txt";

string ftpServerIP = "IP address";

string ftpUserID = "User ID";

string ftpPassword = "Password";

FileInfo fileInf = new FileInfo(filename);

string uri = "ftp://" + ftpServerIP + "/" + fileInf.Name;

FtpWebRequest reqFTP;

// Create FtpWebRequest object

reqFTP = (FtpWebRequest)FtpWebRequest.Create(newUri("ftp://" + ftpServerIP + "/" + fileInf.Name));

//Provide ftp userid and password

reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);

// By default KeepAlive is true, where the control connection is not closed

// after a command is executed.

reqFTP.KeepAlive = false;

//Specify the command to be executed. Here we use upload file command

reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

//data transfer type we use here is binary

reqFTP.UseBinary = true;

// Notify the server about the size of the uploaded file

reqFTP.ContentLength = fileInf.Length;

// The buffer size is set to 2kb

int buffLength = 2048;

byte[] buff = new byte[buffLength];

int contentLen;

// Opens a file stream (System.IO.FileStream) to read the file to be uploaded

FileStream fs = fileInf.OpenRead();

try

{

// Stream to which the file to be upload is written

Stream strm = reqFTP.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 (Exception ex)

{

string ErrMsg = ex.Message;

}