How to specify implemented Service Contract dll in WCF config

My service implementation is present in Calc.dll.

WCF Service is present in Svc.dll

I have added contract inside endpoint tag in the WCF app.config file of Svc.dll.

<service behaviorConfiguration="Default" name="MySvc">
   <endpoint contract="Company.ICalc" .... />

How does WCF know that the service is implemented in Calc.dll? We have just specified the contract name.

In order for this to work, your svc.dll project must somehow reference calc.dll - and thus, the .NET / WCF runtime can find the specified namespace and class.