Quick Start Guide Leave feedback

This guide shows how to create a .NET console application that merges two PDF documents with the JoinPdf plugin.

To build the example application, install the .NET SDK. The sample app targets .NET 10 (the current LTS release); the package itself supports .NET 6.0 or later. Visit the .NET download page to get the latest LTS version.

You can also skip the next steps and download the sample app that we’re going to build here.

Open your terminal and run the following commands to create a new console application:

dotnet new console -o merge-pdf-files
cd merge-pdf-files

Install the GroupDocs.Merger.LowCode package:

dotnet add package GroupDocs.Merger.LowCode

This adds a reference in your .csproj file with the latest available package version:

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

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net10.0</TargetFramework>
    <RootNamespace>merge_pdf_files</RootNamespace>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="GroupDocs.Merger.LowCode" Version="26.9.0" />
  </ItemGroup>

</Project>

Replace the contents of Program.cs with the following code. It appends a one-page cost analysis to a business plan:

using GroupDocs.Merger.Domain.Options;
using GroupDocs.Merger.LowCode;

// Copy and paste your license keys
var publicKey = "<your public license key>";
var privateKey = "<your private license key>";

// Set the license
License.Set(publicKey, privateKey);

// Append the cost analysis to the business plan
var merger = new JoinPdf("business-plan.pdf", new[] { "cost-analysis.pdf" }, new JoinOptions());

// Save the merged document
merger.Save("output/business-plan-with-costs.pdf");

Copy business-plan.pdf and cost-analysis.pdf to the project folder.

Run the application:

dotnet run

The merged document is saved to the output folder of the project. Without a license, the application runs in evaluation mode, and only the first three pages are processed. Request a temporary license to test the full functionality.

Learn more about each plugin in the Developer Guide.