Design your aspx like this
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table align="center">
<tr>
<td colspan="2">
<b>Encryption and Decryption of Password</b>
</td>
</tr>
<tr>
<td>
UserName
</td>
<td>
<asp:TextBox ID="txtname" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
Password
</td>
<td>
<asp:TextBox ID="txtPassword" runat="server" TextMode="Password"></asp:TextBox>
</td>
</tr>
<tr>
<td>
FirstName
</td>
<td>
<asp:TextBox ID="txtfname" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
LastName
</td>
<td>
<asp:TextBox ID="txtlname" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
</td>
<td>
<asp:Button ID="btnSubmit" runat="server" Text="Submit"
onclick="btnSubmit_Click" />
</td>
</tr>
</table>
</div>
<div>
<table align="center">
<tr>
<td>
<b>Encryption of Password Details</b>
</td>
</tr>
<tr>
<td>
<asp:GridView ID="gvUsers" runat="server" CellPadding="4" BackColor="White"
BorderColor="#CC9966" BorderStyle="None" BorderWidth="1px">
<RowStyle BackColor="White" ForeColor="#330099" />
<FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
<PagerStyle BackColor="#FFFFCC" ForeColor="#330099" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC"
HorizontalAlign="Left"/>
</asp:GridView>
</td>
</tr>
</table>
</div>
<div>
<table align="center">
<tr>
<td>
<b>Decryption of Password Details</b>
</td>
</tr>
<tr>
<td>
<asp:GridView ID="gvdecryption" runat="server" BackColor="White"
BorderColor="#CC9966" BorderStyle="None" BorderWidth="1px" CellPadding="4"
onrowdatabound="gvdecryption_RowDataBound">
<RowStyle BackColor="White" ForeColor="#330099" />
<FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />
<PagerStyle BackColor="#FFFFCC" ForeColor="#330099" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />
<HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC" />
</asp:GridView>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
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After that add System.Text namespace in code behind because in this namespace contains classes representing ASCII and Unicode character encodings
After that add following code in code behind and design one table in database with four fields and give name as "SampleUserdetails"
private const string strconneciton = "Data Source=MYCBJ017550027;Initial Catalog=MySamplesDB;Integrated Security=True";
SqlConnection con = new SqlConnection(strconneciton);
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindencryptedData();
BindDecryptedData();
}
}
/// <summary>
/// btnSubmit event is used to insert user details with password encryption
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnSubmit_Click(object sender, EventArgs e)
{
string strpassword = Encryptdata(txtPassword.Text);
con.Open();
SqlCommand cmd = new SqlCommand("insert into SampleUserdetails(UserName,Password,FirstName,LastName) values('" + txtname.Text + "','" + strpassword + "','" + txtfname.Text + "','" + txtlname.Text + "')", con);
cmd.ExecuteNonQuery();
con.Close();
BindencryptedData();
BindDecryptedData();
}
/// <summary>
/// Bind user Details to gridview
/// </summary>
protected void BindencryptedData()
{
con.Open();
SqlCommand cmd = new SqlCommand("select * from SampleUserdetails", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
gvUsers.DataSource = ds;
gvUsers.DataBind();
con.Close();
}
/// <summary>
/// Bind user Details to gridview
/// </summary>
protected void BindDecryptedData()
{
con.Open();
SqlCommand cmd = new SqlCommand("select * from SampleUserdetails", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
gvdecryption.DataSource = ds;
gvdecryption.DataBind();
con.Close();
}
/// <summary>
/// Function is used to encrypt the password
/// </summary>
/// <param name="password"></param>
/// <returns></returns>
private string Encryptdata(string password)
{
string strmsg = string.Empty;
byte[] encode = new byte[password.Length];
encode = Encoding.UTF8.GetBytes(password);
strmsg = Convert.ToBase64String(encode);
return strmsg;
}
/// <summary>
/// Function is used to Decrypt the password
/// </summary>
/// <param name="password"></param>
/// <returns></returns>
private string Decryptdata(string encryptpwd)
{
string decryptpwd = string.Empty;
UTF8Encoding encodepwd = new UTF8Encoding();
Decoder Decode = encodepwd.GetDecoder();
byte[] todecode_byte = Convert.FromBase64String(encryptpwd);
int charCount = Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);
char[] decoded_char = new char[charCount];
Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);
decryptpwd = new String(decoded_char);
return decryptpwd;
}
/// <summary>
/// rowdatabound condition is used to change the encrypted password format to decryption format
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void gvdecryption_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
string decryptpassword = e.Row.Cells[2].Text;
e.Row.Cells[2].Text = Decryptdata(decryptpassword);
}
}
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Demo
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