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From a technological point of view, the two languages are similar. In fact, because of the success of Java, the C # API itself was designed to make it easy for Java programmers to learn C # with ease.
If your specification requires C #, use it. If you are choosing a language to learn, I recommend Java for the following reasons:
Free compiler and tools.
The best IDEs are free too (Eclipse, Netbeans).
The main application servers are also free (eg Tomcat).
It is a versatile language that you can develop applications for PC, Web, embedded systems, tablets and Android phones.
I would highly recommend sticking with Java and playing around with C# once you are doing well in Java. You will see that the languages themselves take only a few hours to learn once you know the other. The real trick is learning their ecosystems and libraries but even seasoned professionals focusing on one or the other platform need references to help with those as they are incredibly massive and constantly changing.