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What is CS0101?

Symptoms

  • You are seeing the following error in the console window:
error CS0101: The namespace `__' already contains a definition for `__'

Cause

CS0101 is caused when a namespace has duplicated identifiers. The example below has the same identifiers for both methods.

Error displayed in this example:

error CS0101: The namespace `ExampleNamespace' already contains a definition for `Method'

Resolution

In order to fix the CS0101, you will need to ensure that each identifier in your namespace is unique. Please see how we have fixed the example below:

This error can also be fixed by ensuring that all classes have a unique identifier. It is common to have duplicate scripts in a project.

More Information

https://msdn.microsoft.com/en-us/library/5b4kb4we(v=vs.90).aspx

 

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