Merge GIF files using C#. For more information, please follow link: https://kb.groupdocs.com/merger/net/merge-gif-files-using-csharp/

Merge GIF Files using C#.cs

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

namespace MergeGIFFilesUsingCSharp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Set License to avoid the limitations of Merger library
            License lic = new License();
            lic.SetLicense(@"GroupDocs.Merger.lic");
  
            using (Merger merger = new Merger(@"sample1.gif"))
            {
                // Define image join options with horizontal join mode
                ImageJoinOptions joinOptions = new 
                    ImageJoinOptions(ImageJoinMode.Horizontal);
                // Add another GIF file to merge
                merger.Join(@"sample2.gif", joinOptions);
                // Define image join options with vertical join mode
                joinOptions = new ImageJoinOptions(ImageJoinMode.Vertical);
                // Add next GIF file to merge
                merger.Join(@"sample3.gif", joinOptions);
                // Merge GIF files and save result
                merger.Save(@"merged.gif");
            }
        }
    }
}