Encrypt and Decrypt Data using Asp.net

Here In code base64 Encryption and Decryption in done.

Simple example I am showing you to make understand.

Example.

In .aspx page

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

<br />

<asp:Button ID="btnencrypt" runat="server" Text="Encrypt" /> <asp:Button ID="btndecrypt" runat="server" Text="Decrypt" />

<br />

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

<br />

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

For Encryption.

.vb

Protected Sub btnencrypt_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnencrypt.Click

        Dim data As String = TextBox1.Text

        Dim encData_byte As Byte() = New Byte(data.Length - 1) {}

        encData_byte = System.Text.Encoding.UTF8.GetBytes(data)

        Dim encodedData As String =              Convert.ToBase64String(encData_byte)

        Lblencrypt.Text = encodedData.ToString()

    End Sub

.C#

protected void btnencrypt_Click(object sender,System.EventArgs e)
{
string data = TextBox1.Text;
byte[] encData_byte = new byte[data.Length];
encData_byte = System.Text.Encoding.UTF8.GetBytes(data);
string encodedData = Convert.ToBase64String(encData_byte);
Lblencrypt.Text = encodedData.ToString();
}

For Decryption.

.vb

Protected Sub btndecrypt_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btndecrypt.Click

        Dim encoder As New System.Text.UTF8Encoding()

        Dim utf8Decode As System.Text.Decoder = encoder.GetDecoder()

        Dim todecode_byte As Byte() = Convert.FromBase64String(Lblencrypt.Text)

        Dim charCount As Integer = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length)

        Dim decoded_char As Char() = New Char(charCount - 1) {}

        utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0)

        Dim result As String = New [String](decoded_char)

        Lbldecrypt.Text = result.ToString()

 End Sub


.C#

protected void btndecrypt_Click(object sender,System.EventArgs e)
{
System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();
System.Text.Decoder utf8Decode = encoder.GetDecoder();


byte[] todecode_byte = Convert.FromBase64String(Lblencrypt.Text);
int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);
char[] decoded_char = new char[charCount];
utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);
string result = new String(decoded_char);
Lbldecrypt.Text = result.ToString();
}

Result