declare a namespace in csharp

To declare a namespace in C#, you can use the namespace keyword followed by the name of the namespace you want to create. You can include multiple namespaces inside a namespace by using the same namespace keyword followed by the name of the nested namespace. Here's an example:

main.cs
namespace MyNamespace {
    // code here
}

namespace MyNamespace.MySubNamespace {
    // code here
}
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You can then use the classes, interfaces, and other types defined in these namespaces in your code by referencing the fully-qualified namespace name. For example, if you have a class MyClass inside MyNamespace, you can refer to it as MyNamespace.MyClass.