I'm c#.net and vb.net programmer , and there is a library called Multi-threading to run 2 processes together , i want to know if there is something similar in Arduino Language
I'm c#.net and vb.net
You'll get over it, given time.
Have a look at the blink without delay example in the IDE.
There are background timing based sequencer libraries to do things at a certain time, and schedulars, and rtos libraries.
There are also pre-emptive multitasking libraries for the Arduino. I know that many libraries are not written for something like that, so it might cause a lot of troubles.
Google for : arduino rtos
It would be nice of one of them was officially supported.
The thread in the following link includes a demo sketch that I wrote to show how the concepts of Blink Without Delay can be used to control several things at the same time.
http://forum.arduino.cc/index.php?topic=223286.0
...R