Download_Merged_PPTX_Files_Online_in_CSharp.cs

// Download Resultant File from the Cloud
using System;
using GroupDocs.Conversion.Cloud.Sdk.Api;
using GroupDocs.Conversion.Cloud.Sdk.Client;
using GroupDocs.Conversion.Cloud.Sdk.Model.Requests;

namespace GroupDocs.Merger.CSharp
{
  // Download Output File
  class Download_File
  {
    static void Main(string[] args)
    {
      try
      {
        // initialize api
        var fileApi = new FileApi(configuration);
        // create download file request
        var downloadRequest = new DownloadFileRequest("csharp-testing/merged-file.pptx", myStorage);
        // download file
        Stream downloadResponse = fileApi.DownloadFile(downloadRequest);

        // save file in working directory
        using (var fileStream = System.IO.File.Create("H:\\groupdocs-cloud-data\\merged-file.pptx"))
        {
          downloadResponse.Seek(0, SeekOrigin.Begin);
          downloadResponse.CopyTo(fileStream);
        }
      }
      catch (Exception e)
      {
        Console.WriteLine("Exception when calling GroupDocs FileApi: " + e.Message);
      }

    }
  }
}

Merge_and_Combine_PowerPoint_PPT_PPTX_Files_in_CSharp.md

You can combine powerpoint slides from different files programmatically on the cloud. In this article, you will learn how to merge and combine PowerPoint PPT/PPTX presentations in C#

The following topics are covered in this article:

1. PowerPoint Merger REST API and C# SDK
2. Merge Multiple PPT/PPTX Files into One in C# using REST API
3. Merge Specific Slides of Multiple PowerPoint Files in C#
4. Combine PowerPoint Presentations in C# using Slides Range

Merge_Range_of_Pages_of_PPTX_Online_in_CSharp.cs

// How to Combine PowerPoint Presentations in C# using Slides Range
using System;
using GroupDocs.Merger.Cloud.Sdk.Api;
using GroupDocs.Merger.Cloud.Sdk.Client;
using GroupDocs.Merger.Cloud.Sdk.Model;
using GroupDocs.Merger.Cloud.Sdk.Model.Requests;
using System.Collections.Generic;

namespace GroupDocs.Merger.CSharp
{
  // Merge and Combine PPT files into one PPT
  class Merge_PowerPoint_Files
  {
    static void Main(string[] args)
    { 

      try
      {
        // Create necessary API instances
        var documentApi = new DocumentApi(configuration);
        var item1 = new JoinItem
        {
          FileInfo = new GroupDocs.Merger.Cloud.Sdk.Model.FileInfo
          {
            FilePath = "csharp-testing/input-sample-file-one.pptx"
          }
        };

        var item2 = new JoinItem
        {
          FileInfo = new GroupDocs.Merger.Cloud.Sdk.Model.FileInfo
          {
            FilePath = "csharp-testing/input-sample-file-two.pptx"
          },
          StartPageNumber = 1,
          EndPageNumber = 5,
          RangeMode = JoinItem.RangeModeEnum.OddPages
        };

        var options = new JoinOptions
        {
          JoinItems = new List<JoinItem> { item1, item2 },
          OutputPath = "csharp-testing/merged-file.pptx"
        };

        var request = new JoinRequest(options);
        var response = documentApi.Join(request);
        Console.WriteLine("Successfully combined PowerPoint slides from different files: " + response.Path);
      }
      catch (Exception e)
      {
        Console.WriteLine("Exception when calling GroupDocs Api: " + e.Message);
      }

    }
  }
}

Merge_Specific_Pages_of_PowerPoint_PPT_Online_in_CSharp.cs

// How to Merge Specific Slides of Multiple PowerPoint Files in C#
using System;
using GroupDocs.Merger.Cloud.Sdk.Api;
using GroupDocs.Merger.Cloud.Sdk.Client;
using GroupDocs.Merger.Cloud.Sdk.Model;
using GroupDocs.Merger.Cloud.Sdk.Model.Requests;
using System.Collections.Generic;

namespace GroupDocs.Merger.CSharp
{
  // Combine PPTX slides into one PPT
  class Merge_PowerPoint_Files
  {
    static void Main(string[] args)
    { 

      try
      {
        
        // Create necessary API instances
        var documentApi = new DocumentApi(configuration);
        var item1 = new JoinItem
        {
          FileInfo = new GroupDocs.Merger.Cloud.Sdk.Model.FileInfo
          {
            FilePath = "csharp-testing/input-sample-file-one.pptx"
          },
          Pages = new List<int?> { 1, 4, 7 }
        };

        var item2 = new JoinItem
        {
          FileInfo = new GroupDocs.Merger.Cloud.Sdk.Model.FileInfo
          {
            FilePath = "csharp-testing/input-sample-file-two.pptx"
          },
          StartPageNumber = 1,
          EndPageNumber = 5,
          RangeMode = JoinItem.RangeModeEnum.OddPages
        };

        var options = new JoinOptions
        {
          JoinItems = new List<JoinItem> { item1, item2 },
          OutputPath = "csharp-testing/merged-file.pptx"
        };

        var request = new JoinRequest(options);
        var response = documentApi.Join(request);
        Console.WriteLine("Successfully combine several powerpoints into one using CSharp: " + response.Path);
      }
      catch (Exception e)
      {
        Console.WriteLine("Exception when calling GroupDocs Api: " + e.Message);
      }

    }
  }
}

Merge_two_PowerPoint_Presentations_in_CSharp.cs

// How to Merge Multiple PPT/PPTX Files into One in C# using REST API
using System;
using GroupDocs.Merger.Cloud.Sdk.Api;
using GroupDocs.Merger.Cloud.Sdk.Client;
using GroupDocs.Merger.Cloud.Sdk.Model;
using GroupDocs.Merger.Cloud.Sdk.Model.Requests;

namespace GroupDocs.Merger.CSharp
{
  // How to Merge PowerPoint Files into One using CSharp
  class Combine_PowerPoint_Presentations

  {
    static void Main(string[] args)
    {

      try
      {
        // Create necessary API instances
        var documentApi = new DocumentApi(configuration);
        var item1 = new JoinItem
        {
          FileInfo = new GroupDocs.Merger.Cloud.Sdk.Model.FileInfo
          {
            FilePath = "csharp-testing/two-slides-file.pptx"
          }
        };

        var item2 = new JoinItem
        {
          FileInfo = new GroupDocs.Merger.Cloud.Sdk.Model.FileInfo
          {
            FilePath = "csharp-testing/one-slide-file.pptx"
          }
        };

        var options = new JoinOptions
        {
          JoinItems = new List<JoinItem> { item1, item2 },
          OutputPath = "csharp-testing/merged-file.pptx"
        };

        var request = new JoinRequest(options);
        var response = documentApi.Join(request);
        Console.WriteLine("Successfully merged PowerPoint PPTX slides online using REST API: " + response.Path);
      }
      catch (Exception e)
      {
        Console.WriteLine("Exception when calling GroupDocs Api: " + e.Message);
      }

    }
  }
}

Upload_to_Merge_PowerPoint_Files_in_CSharp.cs

// Upload Files using C#
using System;
using System.IO;
using GroupDocs.Merger.Cloud.Sdk.Api;
using GroupDocs.Merger.Cloud.Sdk.Client;
using GroupDocs.Merger.Cloud.Sdk.Model;
using GroupDocs.Merger.Cloud.Sdk.Model.Requests;

namespace GroupDocs.Merger.CSharp
{
  class Upload_PowerPoint_Presentations

  {
    static void Main(string[] args)
    {
      
      try
      {
        // Create necessary API instances
        var storageApi = new StorageApi(configuration);
        var fileApi = new FileApi(configuration);

        var path = @"H:\groupdocs-cloud-data";

        var files = Directory.GetFiles(path, "*.pptx", SearchOption.AllDirectories);
        foreach (var file in files)
        {
          var relativeFilePath = file.Replace(path, string.Empty).Trim(Path.DirectorySeparatorChar);

          var response = storageApi.ObjectExists(new ObjectExistsRequest(relativeFilePath, myStorage));
          if (response.Exists != null && !response.Exists.Value)
          {
            var fileStream = File.Open(file, FileMode.Open);

            fileApi.UploadFile(new UploadFileRequest(relativeFilePath, fileStream, myStorage));
            fileStream.Close();
          }
        }

        Console.WriteLine("File Uploaded to Cloud Storage.");
      }
      catch (Exception e)
      {
        Console.WriteLine("Exception when calling GroupDocs API: " + e.Message);
      }

    }
  }
}

Utils_to_Merge_PPTX_Online_in_CSharp.cs

//Get clientId & clientSecret from https://dashboard.groupdocs.cloud (free registration is required).
string clientId = "xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx";
string clientSecret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
string myStorage = "test-internal-storage";

var configuration = new Configuration(clientId, clientSecret);
configuration.ApiBaseUrl = "https://api.groupdocs.cloud";