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    <p>It wasn't "Classic ASP" (which is the COM-heavy, VBScript-friendly platform that was popular from 1997 to 2003) but ASP.NET WebForms which used ViewState. ViewState itself was a Base64-encoded (not encrypted) representation of the page's controls' properties. This was done because HTML Forms don't transmit additional properties back to the server, only <code>&lt;input&gt;s</code>' <code>value=""</code> attributes, so the ViewState included things like a control's background color property (if it was set).</p> <p>In WebForms, developers could use ViewState validation MAC to ensure their viewstate data wasn't altered, but in practice it frequently broke down. If you search for "Validation of viewstate MAC failed" then you'll find countless discussions on how to workaround the issue. However that is an irrelevant point in my post.</p> <p>If you want to use a client form field as a roundtrip data vector, then that's perfectly fine, just do something like the code below.</p> <pre><code>class PageViewModel { public String SecretData; } public ActionResult Foo() { Byte[] someSecretData = GetIcbmLaunchCodes(); someSecretData = ArbitraryEncryptionAlgorithm( someSecretData ); // you can encrypt the data any way you want. I personally recommend a symmetric algorithm like AES or TripleDES. HashAlgorithm hashAlgo = new HMACSHA1(); hashAlgo.Key = /* Your private key for HMAC */ Byte[] hmac = hashAlgo.ComputeHash( someSecretData ); // when using SHA1, hmac will be 160 bits long, or 20 bytes. PageViewModel model = new PageViewModel(); model.SecretData = Convert.ToBase64String( hmac + someSecretData ); // array concatenation is an exercise for the reader return View( model ); } [HttpPost] public ActionResult Foo(PageViewModel model) { Byte[] postedData = Convert.FromBase64String( model.SecretData ); Byte[] hmac = postedData[0...20]; // array substring is an exercise for the reader Byte[] secretData = postedData[20...n]; // Now verify the secret data HashAlgorithm hashAlgo = new HMACSHA1(); hashAlgo.Key = /* Your private key for HMAC */ Byte[] hmac2 = hashAlgo.ComputeHash( secretData ); if( hmac2 != hmac ) { /* the data has been tampered with. */ } else { /* the data is unadulterated */ Byte[] originalSecretData = ArbitaryDecryptionAlgorithm( secretData ); } } </code></pre>
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    1. POHow do I emulate an *encrypted* non-tamperable Viewstate in ASP.NET MVC?
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    1. USDai
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    1. COIf you are using .net 4.5 I would suggest the following to product the data: http://msdn.microsoft.com/en-us/library/system.security.cryptography.protecteddata.aspx
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      1. USRoss Dargan
    2. CO@RossDargan - Anything that uses DPAPI will break a load balancer, since the private keys are not shared across all nodes in the farm
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      1. USAccidentallyObtuse
    3. COTrue, in which case you should use MachineKey.Protect/Unprotect http://msdn.microsoft.com/en-us/library/ee360267.aspx :-)
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      1. USRoss Dargan
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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