❔ ? WPF Build Action(Resource)

I have the following:

string Source = "C\\Images\\This.gif";

string Source = "C\\Images\\This.gif";

how can I include this to the resources automatically rather than manually?

<ItemGroup>
  <Resource Include="Images\This.gif" />
</ItemGroup>

<ItemGroup>
  <Resource Include="Images\This.gif" />
</ItemGroup>