In this article, I will explain you how to convert base64 string to byte array c#.
1) When the image upload button clicked, that particular image file is read into a Byte Array with the help of BinaryReader class Object.
2) Now that Byte Array is converted into Base64 string using Convert.ToBase64String method.
3) Now to save Base64 encoded string as Image File, Base64 string is converted back to Byte Array with the help of Convert.FromBase64String function.
4) Lastly, the Byte Array save to your folder as a file using WriteAllBytes method.