TENS group will receive the conventional physiotherapy treatment plus TENS. TENS is most commonly used directly on affected muscles in patients with CP. The device will be used from Cosmogamma company (MIXING 2 (EVO): COMBINED THERAPY). It consists of 3 parts: the stimulator part, electrode and connected wires. Strap or plaster for electrodes adhesive with gel. Electrode diameter (6×4.5 cm). The program will be (Pain therapy - TENS - Free program - Modify -Parameter's setup).

Parameter setup (pulse frequency= 100 Hz, pulse duration= 250 μs, time=30 minutes and the intensity according to patient to feel tingling sensation only and no muscle contraction).

The Control group will receive the conventional physiotherapy treatment for upper limb spasticity only.

Put the patient in comfort position as long sitting on bed with a supported back and a pillow under the forearm, clean the skin by alcohol swab, setup the parameter, put a gel on electrodes then placed the negative electrode (black wire) over biceps belly and positive electrode (red wire) 3 cm distally from negative electrode , turn on TENS device .

With increase the intensity gradually until patient feel a tingling sensation (no muscle contraction) and every 10 minutes ask patient about the feeling until complete 30 minutes.

The modified Ashworth scale is the most widely used clinical instrument for determining muscle tone changes. In this study will measure the elbow flexor spasticity by 3 examiners (3 minutes rest in between), then will calculate the average. MAS grades of spasticity are as follows: 0 = normal muscle tone; 1= slight increase in muscle tone, manifested by catch and release or by minimal resistance at the end; 1+ = slight increase in muscle tone, manifested by a catch, followed by minimal resistance throughout; 2= more marked increase in muscle tone, but limb easily flexed; 3= considerable increase in muscle tone, passive movement difficult; and 4 = limb rigid in flexion or extension. According to inclusion criteria, patients with grades 2 or 3 will be enrolled , then after intervention may be this grade will be deceased ( spasticity decreased ).

Digital goniometer is a valid tool for assessing joint range of motion. The digital goniometer has adequate concurrent criterion-related validity and comparable inter- and intra-rater reliability to the Universal goniometer. Three examiners will measure elbow joint range of motion (from full flexion to full extension), ( passively) 3 minutes rest in between.

The Barthel is a quick and accurate, reliable assessment of mobility and activity of daily living , that works in both skillful and unskilled hands. In this study, the investigators will choose the items related to upper limb function (feeding, bathing, grooming, dressing and toilet use) with total score 40 which indicating highest independence and 0 indicating highest dependence .