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1) FORM THE URL

This method is to get the current URL
1) http://localhost:64591/

2) http://sit/test/

public string GetWebAppRoot()

{

  if (HttpContext.Current.Request.ApplicationPath == "/")

    return "http://" + HttpContext.Current.Request.Url.Authority;

  else

    return "http://" + HttpContext.Current.Request.Url.Authority +            HttpContext.Current.Request.ApplicationPath;

}

string URL = GetWebAppRoot() + "/URL.aspx?";

2) CREATE ENCRYPTION CLASS

public class QueryStringEncryption

{

    private byte[] key = { };

    private byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef };

     

    public string Decrypt(string stringToDecrypt)

    {

        byte[] inputByteArray = new byte[stringToDecrypt.Length + 1];

        try

        {

           key = System.Text.Encoding.UTF8.GetBytes("mkadm11n");

           DESCryptoServiceProvider des = new DESCryptoServiceProvider();

           inputByteArray = Convert.FromBase64String(stringToDecrypt);

           MemoryStream ms = new MemoryStream();

           CryptoStream cs = new CryptoStream(ms,

           des.CreateDecryptor(key, IV), CryptoStreamMode.Write);

           cs.Write(inputByteArray, 0, inputByteArray.Length);

           cs.FlushFinalBlock();

           System.Text.Encoding encoding = System.Text.Encoding.UTF8;

           return encoding.GetString(ms.ToArray());

         }

         catch (Exception e)

         {

                return e.Message;

         }

     }

     public string Encrypt(string stringToEncrypt)

     {

        try

        {

           key = System.Text.Encoding.UTF8.GetBytes("mkadm11n");

           DESCryptoServiceProvider des = new DESCryptoServiceProvider();

           byte[] inputByteArray = Encoding.UTF8.GetBytes(stringToEncrypt);

           MemoryStream ms = new MemoryStream();

           CryptoStream cs = new CryptoStream(ms,

           des.CreateEncryptor(key, IV), CryptoStreamMode.Write);

           cs.Write(inputByteArray, 0, inputByteArray.Length);

           cs.FlushFinalBlock();

           return Convert.ToBase64String(ms.ToArray());

        }

        catch (Exception e)

        {

                return e.Message;

        }

 }

2)  ENCRYPT INPUT PARAM

1)URLEncode param 1st, because special word like ?,= will have error

2)Encypt it to protect the URL, not let user to see the info

QueryStringEncryption queryStringEncrption = new QueryStringEncryption();

string queryString = string.Format("UserID={0}&NewPassword={1}&SentDate={2}", user.UserID, HttpUtility.UrlEncode(user.Password), HttpUtility.UrlEncode((DateTime.Now).ToString()));

string encyptedQS = queryStringEncrption.Encrypt(queryString);

URL = URL + encyptedQS;

content = content + "Please Click this <a href=\"" + URL + "\">link </a>";

3)  URL PAGE LOAD

1)Get Raw URL
2)Decrypt and URLDecode

queryString = Request.RawUrl;

queryString = queryString.Substring(queryString.IndexOf('?') + 1);

queryString = queryStringEncrption.Decrypt(queryString);

string[] arrMsgs = queryString.Split('&');

string[] arrValue;

                      

arrValue = arrMsgs[0].Split('='); //Get Name

long userID = Convert.ToInt64(HttpUtility.UrlDecode(arrValue[1].ToString()));