I missed program.cs in my Solution Explorer by Contact File. Where can i find it?

I am now using Headfirst second edition. I am done with chapter 1, and now busy in chapter 2. The IDE helps you code where i am now doing. I saw the Solution Explorer table and the program.cs is included. But when i saw the solution explorer which i made isn't there. Anyone could help me what should i do to find the program.cs?
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