Top-level statements do not issue errors with other Main method declarations

[MarkMichaelis]

It's also an error if you combine top-level statements with a declared program entry point method, typically a Main method. In a sense, you can think that one file contains the statements that would normally be in the Main method of a Program class.

The compiler will only issue an error if the type name is Program. You could, for example, have

class HelloWorld
{
  static void Main() {}
}

This will result in a warning, but not an error.

Consider the following rewording:

It's warning if you combine top-level statements with a declared program entry point method, typically a Main method. In a sense, you can think that one file contains the statements that would normally be in the Main method of a Program class. For this reason, you cannot, in fact, declare your own Program class - as this is the name given to the class generated by the C# compiler for top-level statements.

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Document Details

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• ID: d75fd4d4-6fc5-62b9-95be-69c7e20ff094
• Version Independent ID: f4efd3be-0877-c8f9-32e0-58638759b46b
• Content: What's new in C# 9.0 - C# Guide
• Content Source: docs/csharp/whats-new/csharp-9.md
• Product: dotnet-csharp
• Technology: csharp-whats-new
• GitHub Login: @BillWagner
• Microsoft Alias: wiwagn

[BillWagner]

this article has been retired, and the articles on top level statements now include that this is a warning