MonoGame.Samples/XNAGameDevelopmentbyExample/FloodControl/Core/FloodControl.Core.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <RootNamespace>Flood_Control</RootNamespace>
    <AssemblyName>FloodControl.Core</AssemblyName>
    <LangVersion>latest</LangVersion>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="MonoGame.Framework.DesktopGL" Version="3.8.*" />
  </ItemGroup>

</Project>