WPF - Build Error總結

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1. are you missing an assembly reference

給項目添加新控制項的時候，經常發現這種錯誤

Error 21 The type or namespace name ‘CustomControls‘ does not exist in the namespace ‘***.**MS‘ (are you missing an assembly reference?) 

解決方案： Please go to your project properties and check the targeting framework version. I believe, your‘s would be 3.5. Change it to 4.0 and compile. The error will get resolved by automatically, by adding the necessary referance for the project to be build.