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PONull Refernce Exception after encrypting web.config file using Data Protection API
 

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  1. PONull Refernce Exception after encrypting web.config file using Data Protection API
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    <p>I have encrypted the <strong>appSettings</strong> and <strong>connectionStrings</strong> section of the web.config file of my web application.</p> <p>These are the two commands that I entered at the Visual Studio 2010 command prompt:</p> <pre><code>aspnet_regiis.exe -pef "connectionStrings" C:\Provider -prov "DataProtectionConfigurationProvider" aspnet_regiis.exe -pef "appSettings" C:\Provider -prov "DataProtectionConfigurationProvider" </code></pre> <p>Now, these two commands produced a new web.config file situated in the directory along with the solution file. I opened this web.config file, which only contained the encrypted appSettings and connectionStrings section of the original web.config file.</p> <p>I then opened my web application, deleted the original <strong>appSettings</strong> and <strong>connectionStrings</strong> sections and pasted the encrypted ones.</p> <p>This is how my web.config file looks now:</p> <pre><code>&lt;configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"&gt; &lt;appSettings configProtectionProvider="DataProtectionConfigurationProvider"&gt; &lt;EncryptedData&gt; &lt;CipherData&gt; &lt;CipherValue&gt;AQAAANCMnd8BFdERjHoAwE/Cl+sBAAAA6h2T0PWsHUC2CPpYvY8QUwQAAAACAAAAAAAQZgAAAAEAACAAAAAdlSIaGrQ1CFjswJi2RxekJ4ZxmRArilsOiqrmUXt6JgAAAAAOgAAAAAIAACAAAACaV/bVjlK60wX9LOFzRsrkbcDjSOT+3Qj0JyUZZszNNSAAAACaQC3oKCPX1gaxZK3ghS6lAMcVwpNpbMpyNpeoiwxap0AAAAD87rr8QUaIQJv2Sc+i+RGWq1+vExAPNjjG1VtWvK4ILsOX88iBRRx0tpAFdNAw0AvGoxUTA7UQGKm7hTHBaAMz&lt;/CipherValue&gt; &lt;/CipherData&gt; &lt;/EncryptedData&gt; &lt;/appSettings&gt; &lt;connectionStrings configProtectionProvider="DataProtectionConfigurationProvider"&gt; &lt;EncryptedData&gt; &lt;CipherData&gt; &lt;CipherValue&gt;AQAAANCMnd8BFdERjHoAwE/Cl+sBAAAA6h2T0PWsHUC2CPpYvY8QUwQAAAACAAAAAAAQZgAAAAEAACAAAAB4Y7QqEGRvo9T04hE8hvd3wMvRXqIMa/UJBkOQnMnsbgAAAAAOgAAAAAIAACAAAADnzwxmuoWUQLYJ0/YPUkgvR/xyXDZNaQI4ZrMmACqvaTAAAAC6C0nEhW+g8WHcNJLN5DRi8uNimkG3GyMEajrB33ST7DN49W925xIeMiN3kvyLAcJAAAAAPcgh+jh6RzsfQElj7/e1RNAQEFQykiqYfLbUEMd+qHcfkLCNwe3tczJQDckGH1cT7Y9At16pPfek1bKZeM7YpQ==&lt;/CipherValue&gt; &lt;/CipherData&gt; &lt;/EncryptedData&gt; &lt;/connectionStrings&gt; &lt;system.web&gt; &lt;compilation debug="true" explicit="true" targetFramework="4.0"/&gt; &lt;httpCookies httpOnlyCookies="true" requireSSL="true"/&gt; &lt;customErrors mode="On" defaultRedirect="DefaultErrorPage.htm"&gt; &lt;error statusCode="404" redirect="ErrorPage.htm"/&gt; &lt;/customErrors&gt; &lt;trace enabled="false"/&gt; &lt;/system.web&gt; &lt;/configuration&gt; </code></pre> <p>The problem that I have now is that when I try to use a page which accesses data in the web.config file (such as the connection string), I am getting a null reference exception.</p> <p>For instance, this line generates a null reference exception:</p> <pre><code>string connection = ConfigurationManager.ConnectionStrings["DB_Connection"].ConnectionString; </code></pre> <p>How can I solve this please? Thank you :)</p> <p><strong>Clarification</strong></p> <p>The line worked perfectly before encrypting using the Data Protection API. The null reference exception started cropping up after encryption.</p>
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    1. USMatthew
    1. USMatthew
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    1. COAlmost all cases of `NullReferenceException` are the same. Please see "[What is a NullReferenceException in .NET?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-in-net)" for some hints.
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      1. USJohn Saunders
    2. COClearly `ConfigurationManager.ConnectionStrings["DB_Connection"]` is `null`. When you debug this, what values are in the `ConfigurationManager.ConnectionStrings` collection?
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      1. USDavid
    3. COI hope that you actually realize that your problem is that `ConfigurationManager.ConnectionStrings["DB_Connection"]` is null? I hope you simply didn't state that clearly in the question.
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      1. USJohn Saunders
 

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