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Start by writing a Dockerfile in the root directory of your .NET 6 application.
Specify the base image for your Dockerfile. Since your .NET 6 application relies on .NET Framework DLL libraries, you need to use an image that has both .NET 6 and .NET Framework installed. You can use the Microsoft SDK image with the latest .NET 6 and .NET Framework:
```
FROM mcr.microsoft.com/dotnet/sdk:6.0-windowsservercore-ltsc2019
```
Next, copy the files and directories of your .NET 6 application to the Docker image. Add the following lines of code:
```
WORKDIR /app
COPY . .
```
Now, you need to install .NET Framework on the Docker image. To do so, you can use the RUN command to install the appropriate .NET Framework version. For example, to install .NET Framework 4.8, add this line:
```
RUN dotnet-install.ps1 -Version 4.8.0 -InstallDir $Env:ProgramFiles(x86)\dotnet
```
Note: You need to download and include the dotnet-install.ps1 script in your project directory to run this command.
You also need to set the DOTNET_FRAMEWORK_VERSION environment variable to the version of .NET Framework that you installed. Add the following line of code:
```
ENV DOTNET_FRAMEWORK_VERSION=4.8
```
Finally, you can specify the entry point for your Docker container using the CMD command. For example, add the following line of code to run your .NET 6 application:
```
CMD ["dotnet", "run"]
```
Build your Docker image using the docker build command. Run the following command in the terminal:
```
docker build -t myapp .
```
Note: Make sure to replace myapp with the name of your application.
Run your Docker container using the docker run command. Run the following command in the terminal:
```
docker run myapp
```
Note: Again, make sure to replace myapp with the name of your application.