In almost 90% of projects, we need to upload images to server and store them. In most cases, hackers try to exploit an image upload system and try to upload exploitable materials like webshells, some harmful scripts, table deletions scripts, etc. To prevent this, I have written one helper function which validates file in many conditions and makes sure the file is in correct image format. The code is not fully written by me, I researched many articles and filtered the conditions which helps us to validate the required output. /// <summary> /// Verifies that a uploading file is in valid Image format /// </summary> /// <author> /// Mayur Lohite /// </author> /// <param name="postedFile">File which is selected for upload</param> /// <param name="imageMinBytes">Minimum file size in byte</param> /// <param name="imageMaxBytes">