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    <p>Hii all, thank you for your assistance... and i got some difference sort of solution from some other sites. i don't know that the best solution. that is to encode the value using an encryption and decryption algorithm... The sample code has been written like this...</p> <pre><code>&lt;a href='Page1.aspx?UserID=&lt;%= HttpUtility.UrlEncode(TamperProofStringEncode("5","F44fggjj")) %&gt;'&gt; Click Here&lt;/a&gt; &lt;!--Created one anchor tag and call the function for TamperProofStringEncode--&gt; </code></pre> <hr> <pre><code> private string TamperProofStringEncode(string value, string key) { System.Security.Cryptography.MACTripleDES mac3des = new System.Security.Cryptography.MACTripleDES(); System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider(); mac3des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(key)); return Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(value)) + "-" + Convert.ToBase64String(mac3des.ComputeHash(System.Text.Encoding.UTF8.GetBytes(value))); } </code> </pre> <hr> <p>In the page load of 'Page1' call the decode algorithm to decode the query string</p> <pre><code>try { string DataString = TamperProofStringDecode(Request.QueryString["UserID"], "F44fggjj"); Response.Write(DataString); } catch (Exception ex) { Response.Write(ex.Message); } </code></pre> <hr> <pre><code>private string TamperProofStringDecode(string value, string key) { string dataValue = ""; string calcHash = ""; string storedHash = ""; System.Security.Cryptography.MACTripleDES mac3des = new System.Security.Cryptography.MACTripleDES(); System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider(); mac3des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(key)); try { dataValue = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(value.Split('-')[0])); storedHash = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(value.Split('-')[1])); calcHash = System.Text.Encoding.UTF8.GetString(mac3des.ComputeHash(System.Text.Encoding.UTF8.GetBytes(dataValue))); if (storedHash != calcHash) { //'Data was corrupted throw new ArgumentException("Hash value does not match"); // 'This error is immediately caught below } } catch (Exception ex) { throw new ArgumentException("Invalid TamperProofString"); } return dataValue; } </code></pre>
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    1. POHow to protect from tampering of query string?
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    1. USJibu P C_Adoor
    1. USJibu P C_Adoor
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    1. COI still think you might get away with using the session. But if you for some reason rally absolutely **need** to do this via the query string and are willing to go that path it will probably work that way. I would still have a foul smell in my mouth though. It still depends... **Why** do you want this or **what exactly** do you want to achieve? You might be on the wrong track...
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    2. COMy use is, I have sent a mail with the content of a link along with the user id. When i clicks on the link in the mail will navigate to the page then the page will show the details of the particular user
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