Ajuda se puder em c#

private void button_Click(object sender, EventArgs e)
        {
                openFileDialog1.Filter = "BIN Files|*.bin|All Files|*.*";
                openFileDialog1.FilterIndex = 1;
                openFileDialog1.Title = ("Abra Seu_bin file");
                openFileDialog1.FileName = ("Abra Seu_bin");
                openFileDialog1.RestoreDirectory = true;
                if(openFileDialog1.ShowDialog() == DialogResult.OK)
                {
                try
                {
                BinaryReader reader = new BinaryReader(new FileStream(openFileDialog1.FileName, FileMode.Open));
                //Set the position of the reader
                 reader.BaseStream.Position = 0x0001fc06;
                //Read the offset
                  abrbloco00016c.Text = BitConverter.ToString(reader.ReadBytes(512)).Replace("-", null); //reader.ReadBytes(512)
                // read the offset in string (assuming you want that)
                }
                catch
                {

SaveFileDialog saveFileDialog1 = new SaveFileDialog();    
         saveFileDialog1.Title = "Salvar o Bloco";
         saveFileDialog1.FileName = "Bloc.bin";
         saveFileDialog1.CheckPathExists = true;
         saveFileDialog1.DefaultExt = "bin";
         saveFileDialog1.Filter = "Binary File (*.bin)|*.bin";
         saveFileDialog1.FilterIndex = 2;
         saveFileDialog1.RestoreDirectory = true;  

        if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            
         {        
           File.WriteAllText(saveFileDialog1.FileName, resultado.Text);
         }

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