Need some help in programming 8051 with keil C

all you need to do is to write a piece of code that outputs a 12-bit number onto two ports. something like

#define OUT(x) {HIGH_PORT = (x) >> 8; LOW_PORT = (x) & 0x00ff;}

would work in C. HIGH_PORT would be the port where you output the highest 4 bits and LOW_PORT is one for the lowest 8 bits.

you can write fancier ones obviously but that should get you started.

all you need to do is to write a piece of code that outputs a 12-bit number onto two ports. something like

#define OUT(x) {HIGH_PORT = (x) >> 8; LOW_PORT = (x) & 0x00ff;}

would work in C. HIGH_PORT would be the port where you output the highest 4 bits and LOW_PORT is one for the lowest 8 bits.

you can write fancier ones obviously but that should get you started.

Did you follow the instructions here: http://www.keil.com/support/man/docs/uv4/uv4_ca_createhexfile.htm

"whil iam saving it as .hex file..."

What do you mean by that?

You don't "save it as" a hex file; the build process creates the hex file for you - assuming you configured your project correctly (see above), and that the build completed without problems.

Have you checked that a hex file is created?

Have you checked that it is actually a valid hex file?
see: http://www.keil.com/support/docs/1584.htm

"...and load the the program it is detecting as Binary"

What, exactly, is "detecting as Binary" ?

"Can anyone say why iam getting this problem please..."

Not on the description you have provided! You need to take more care to clearly explain pricesely what steps you are taking, what tools you are using, and what results you are seeing.

Remember: nobody knows anything about you, or your project, other than what you clearly describe in your posts!
We cannot read your mind; We cannot see your code; etc, etc,...

Do you not have any colleagues, tutors, mentors, or other local support?