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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