Check out example codes for "how to add an embedded resource in visual studio code". It will help you in understanding the concepts better.
Code Example 1
//Add this item in your .csproj file
<ItemGroup>
<EmbeddedResource Include="GreetingResources.resources" />
</ItemGroup>
//Also, when referencing the resource, make sure you include the namespace relevant to it.
ResourceManager rm = new ResourceManager("namespace.GreetingResources",
typeof(ClassName).Assembly);
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