Creating basic Hex reading/writing app

Question

Hey Im new to c# and I was wondering how I would go about making an app that will let me open a file read a certain offset (say 0x0C) and then have the byte at that offset show up in a textbox. also being able to edit that byte in the textbox and then save the changes with a button. Help with writing this code would be highly appriciated.

Alan · Answer

Here's some basic code to do that. I'll leave it to you to add any error handling you need: using System.IO; // add these fields to form private FileStream fs; private int offset = 0x0C; // or whatever private string filePath; // in read button click eventhandler filePath = somefile.bin; fs = File.Open(filePath FileMode.Open FileAccess.Read); BinaryReader br = new BinaryReader(fs); br.BaseStream.Seek(offsetSeekOrigin.Begin); byte b = br.ReadByte(); br.Close(); textBox1.Text = b.ToString(X2); // display in hex // after edit in save button click eventhandler byte b = Convert.ToByte(textBox1.Text 16); fs = File.Open(filePath FileMode.Open FileAccess.Write); BinaryWriter bw = new BinaryWriter(fs); bw.Seek(offsetSeekOrigin.Begin); bw.Write(b); bw.Close();