Password Encryption & Decryption using C#

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using Microsoft.VisualBasic;

public partial class PasswordEncyrption : System.Web.UI.Page
{
   
    protected void Button1_Click(object sender, EventArgs e)
    {
        
        string sData = TextBox1.Text;
        Label3.Text  = PasswordEncryption(ref sData);
        Label3.Visible = true;
        Label2.Visible = true;
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        string sData = Label3.Text;
        TextBox1.Text = PasswordDecription(ref sData);
    }
    public string PasswordDecryption(ref string Data)
    {
        string Data1 = "";
        string sData = "";

        while (Data.Length > 0)
        {
            Data1 = System.Convert.ToChar(System.Convert.ToUInt32(Data.Substring(0, 2), 16)).ToString();
            sData = sData + Data1;
            Data = Data.Substring(2, Data.Length - 2);
        }
        return sData;
    }
    public string PasswordEncryption(ref string Data)
    {
        string sValue;
        string sHex = "";
        while (Data.Length > 0)
        {

            sValue = Conversion.Hex(Strings.Asc(Data.Substring(0, 1).ToString()));
            Data = Data.Substring(1, Data.Length - 1);
            sHex = sHex + sValue;
        }
        return sHex;
    }
   
}