Introduction In ASP.NET Core, you can restrict the uploaded file size using the RequestSizeLimit attribute in the Program.cs file or by configuring it in the appsettings.json file. Additionally, you can set the maximum file size programmatically in your controller actions. Why do we need to restrict uploaded File Size in an ASP.NET Core? Preventing Denial of Service (DoS) Attacks: Allowing unrestricted file uploads can open your application to DoS attacks where malicious users upload excessively large files, consuming server resources and potentially crashing the application or degrading its performance. Limiting file sizes helps mitigate this risk by preventing excessively large uploads. Optimizing Server Resources: Large file uploads consume server resources such as memory and disk space. By restricting file sizes, you can better manage these resources, ensuring that your application remains responsive and efficient, especially in shared hosting environments where r...