Encrypt & Decrypt Data in asp.net with c#

Copy Belove code IN Default.aspx 
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> 
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
http://www.w3.org/1999/xhtml"> 


Id 

Name 
without decrypt

Copy Belove code in default.aspx.cs page 
using System; 
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 System.Data.SqlClient; 
using System.Security.Cryptography; 
using System.IO;using System.Text; 
public partial class _Default : System.Web.UI.Page 
{ 
SqlConnection con = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=DataDirectory\Database.mdf;Integrated Security=True;User Instance=True"); 
protected void Page_Load(object sender, EventArgs e) 
{ 
} 
//Encrypt Text public string EncryptText(string str) 
{ return Encrypt(str, "&%#@?,:*"); 
} 
// Decrypt the text 
public string DecryptText(string strText) 
{ return Decrypt(strText, "&%#@?,:*"); 
} 
//The function used to encrypt the text 
private string Encrypt(string strText, string strEncrKey) 
{ 
byte[] byKey = { }; byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD,0xEF }; 
byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0,8)); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 
byte[] inputByteArray = Encoding.UTF8.GetBytes(strText); 
MemoryStream ms = new MemoryStream(); 
CryptoStream cs=new CryptoStream(ms, des.CreateEncryptor(byKey, IV),CryptoStreamMode.Write); 
cs.Write(inputByteArray,0,inputByteArray.Length); 
cs.FlushFinalBlock(); 
return Convert.ToBase64String(ms.ToArray()); 
} 
//The function used to decrypt the text private string Decrypt(string strText, string sDecrKey) 
{ 
byte[] byKey = { }; 
byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; 
byte[] inputByteArray = new byte[strText.Length]; 
byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0,8)); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 
inputByteArray = Convert.FromBase64String(strText); 
MemoryStream ms = new MemoryStream(); 
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write); 
cs.Write(inputByteArray, 0, inputByteArray.Length); 
cs.FlushFinalBlock(); 
System.Text.Encoding encoding = System.Text.Encoding.UTF8; 
return encoding.GetString(ms.ToArray()); 
} 

protected void btnAdd_Click(object sender, EventArgs e) 
{ 
string name = EncryptText(txtName.Text); 
con.Open(); 
SqlCommand cmd = new SqlCommand("Insert into emp values('"+name+"')",con); cmd.ExecuteNonQuery(); 
con.Close(); 
} 
protected void btnSelect_Click(object sender, EventArgs e) 
{ 
con.Open(); 
SqlCommand cmd = new SqlCommand("Select * from emp where id='"+txtId.Text+"'",con); 
SqlDataReader dr = cmd.ExecuteReader(); 
while (dr.Read()) 
{ 
string name = DecryptText(dr[1].ToString()); 
txtName.Text = name; 
txtWde.Text = dr[1].ToString(); 
} 
con.Close(); 
} 

}