Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly

It is quite often that developer encounter the following error when creating WCF application in IIS 7.

Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.


Resolution : goto your Microsoft.NET Framework folder and run aspnet_regiis /iru

The switch /iru - Reinstall this version of ASP.Net without forcing existing application to use this version.

More information from this link.

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If you're getting  exception when trying to assigned key to a symmetric key and getting error message below :- The specified initialization vector (IV) does not match the block size for this algorithm And your code probably look like something below :- Then you need to go into debug mode and start looking into the supported size for IV as shown in diagram below :- As you can see, IV is 16 bytes, so you need to provide 16 bytes. The same goes for Key field too, if you're adding anything to it. As long as you provide a valid key size, then we're good and you're code will be ready.
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