Set maximum upload limit on images in Episerver

FileSizeValidationInitializationModule.cs

using EPiServer.Framework;
using EPiServer.Framework.Initialization;
using EPiServer.Core;
using EPiServer.ServiceLocation;
using Alloy.Models.Media;
using EPiServer;

namespace Alloy.Business.Initialization
{
    [InitializableModule]
    [ModuleDependency(typeof(EPiServer.Web.InitializationModule))]
    public class FileSizeValidationInitializationModule : IInitializableModule
    {
        private IContentEvents contentEvents => ServiceLocator.Current.GetInstance<IContentEvents>();
        private IContentRepository contentRepository => ServiceLocator.Current.GetInstance<IContentRepository>();

        public void Initialize(InitializationEngine context)
        {
            contentEvents.CreatingContent += ContentEvents_CreatingContent;
        }

        private void ContentEvents_CreatingContent(object sender, EPiServer.ContentEventArgs e)
        {
            if (e.Content is ImageFile)
            {
                var imageFile = e.Content as ImageFile;
                using (var blobData = imageFile.BinaryData.OpenRead())
                {
                    if (blobData.Length > 1048576)
                    {
                        e.CancelAction = true;
                        e.CancelReason = "File size exceeds the maximum allowed (1 MB).";
                    }
                }
            }
        }

        public void Uninitialize(InitializationEngine context)
        {
            //Add uninitialization logic
        }
    }
}