Convert an image into hexadecimal code

Using system. IO;
Write text files from images!
Private void button#click (Object sender, system. eventargs E)
{
Filestream FS = NULL;
Binaryreader BR = NULL;
Streamwriter Sw = NULL;

Try
{

FS = new filestream ("aa.bmp", filemode. Open, fileaccess. Read );
BR = new binaryreader (FS );
Sw = new streamwriter ("bb.txt ");
Int length = (INT) fs. length;
While (length> 0)
{
Byte tempbyte = Br. readbyte ();
Int tempint = convert. toint32 (tempbyte );
String tempstr = convert. tostring (tempint, 16 );
Sw. writeline (tempstr );
Length --;
}


}
Catch (exception exce)
{
MessageBox. Show (exce. Message );
}
Finally
{
Sw. Close ();
BR. Close ();
FS. Close ();
}

}
Read from text and restore to image!
Private void button2_click (Object sender, system. eventargs E)
{

Filestream FS = NULL;
Binarywriter BW = NULL;
Streamreader sr = NULL;
Try
{
FS = new filestream ("cc.bmp", filemode. Create, fileaccess. Write );
BW = new binarywriter (FS );
Sr = new streamreader ("bb.txt ");
While (Sr. Peek ()! =-1)
{
String tempstr = Sr. Readline ();
Int tempint = convert. toint16 (tempstr, 16 );
Byte tempbyte = convert. tobyte (tempint );
Bw. Write (tempbyte );
}

}
Catch (exception exce)
{

MessageBox. Show (exce. Message );
}
Finally
{
Sr. Close ();
Bw. Close ();
FS. Close ();
}

}