Dear Yousif 

you can do this with these video

 Automatic water level sensor using labview

https://www.slideshare.net/Alokgolmal/automatic-water-level-sensor-using-labview

https://www.youtube.com/watch?v=CiXHjKJWWSk

This project represents the water tank depth sensor system design for measurement of water level using arudino and LabVIEW software. Here we used a ultrasonic sensor to measure the water depth, and from that measurement it calculates how full the tank is. This sensor switches ON the pump when the water level in the tank goes low and switches it OFF as soon as the water level reaches a predetermined level. The ultrasonic sensor connected to the arduino board as a input signal. The Arduino then reads the height of the water and reports the depth of the tank. The same program is interfaced with labview and in the front panel of labview which we can visually see the level of water tank and how the motor is ON and OFF depend on the water level requirement.

BR

see labview examples!

Thank you,  for all 

You may find this useful too. We didn't use Labview but you may find our approach useable. 

Conference Paper Design and Implementation of a Sensorless Microcontroller Ba...

Hello,

I am suggesting the water level sensor by ultrasonic sensors. Hereby there's a link regarding distance by ultrasonic sensors. You can manipulate this thing into water level project considering water level itself as a distance, 

https://www.youtube.com/watch?v=rTM5gZxBPmY

Regards and all the best.

U can see see labview examples!

Thank You for all