April | 2013 | Versatile Digital DNA

Contains the code for AES encryption and decryption in C#.

public byte [] EncryptText(string plainData)
        {
            RijndaelManaged rij = new RijndaelManaged();
            
            rij.GenerateKey();
            _key = rij.Key;
  
            rij.GenerateIV();
            _intializationVector = rij.IV;
  
            ICryptoTransform encryptor = rij.CreateEncryptor(_key, _intializationVector);
  
            using (MemoryStream msEncrypt = new MemoryStream())
            {
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                {
                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                    {
                        swEncrypt.Write(plainData);
                    }
  
                    return msEncrypt.ToArray();
                }
            }
  
        }
  
  
        public string  DecryptText(byte [] encrytedData)
        {
            RijndaelManaged rij = new RijndaelManaged();
  
            ICryptoTransform decryptor = rij.CreateDecryptor(_key, _intializationVector);
  
            using (MemoryStream msDecrypt = new MemoryStream(encrytedData))
            {
                using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                {
                    using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                    {
                        return srDecrypt.ReadToEnd();
                    }
                }
            }
        }
        
    }

ASP.NET

ASP.NET UI updates are handles using Ajax. In this example it is described how to use the ASP.NET Ajax for the updates.

In ASP.NET Ajax we can have update panel and make the updates via Ajax calls. Prepare your ASPX markup like below.

<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
        
        <div>
            <asp:Button ID="BtnPostback" runat="server" Text="PostBack" OnClick="BtnPostback_Click" />
        </div>
  
        <div>
            <asp:UpdateProgress ID="UpdateProgress1" runat="server">
                <ProgressTemplate>
                    <asp:Label Text="Working..." ID="LblBusyIndicator" runat="server"></asp:Label>
                </ProgressTemplate>
            </asp:UpdateProgress>
        </div>
  
        <div>
            <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                <ContentTemplate>
                    <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
                </ContentTemplate>
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="BtnPostback" />
                </Triggers>
            </asp:UpdatePanel>
        </div>
  
    </form>
</body>

Code behind..

private void PerformTask()
{
    // job time 4 - 10 seconds
    int time = new Random().Next(4, 11);
    Thread.Sleep(1000 * time);
    Label1.Text = String.Format("Hello from worker - ran for {0} seconds", time);
}
  
  
protected void BtnPostback_Click(object sender, EventArgs e)
{
    PerformTask();
}

Silverlight

Silverlight the platform itself is asynchronous. And we can have the same mechanism we used in WPF for the UI updates, but little different.

Read the Silverlight Dispatcher for the Silverlight UI updates

Versatile Digital DNA

Monthly Archives: April 2013

AES Cryptography

UI Updates – Part 2

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