How can i apply similar halftone effect to text ?

See also here:

https://community.adobe.com/t5/illustrator-discussions/applying-a-halftone-gradient-to-text/m-p/14978302#M426685

With the Appearance panel, gradients, the Offset path effect and the Pathfinder-unite effect, the effects Rasterize and halftone.https://youtu.be/Q8qHt4NGwos

If you want it as a live effect for just one text object, then you need the plugin Phantasm. Alternatively you can apply a halftone dots pattern. 

@Muhammad Sattar try this...
1. Type your text out
2. Select your text and go to Effect - Pixelate - Color Halftone (you can play around with the size, angles and channels)

or

For a Gradient Style
1. 1. Type your text out. Make two copies. 
2. Select 1 text & outlines text (Type - Create Outlines) Keyboard shortcuts(C0mmand Shift O (Mac) or Control Shift O (PC)
3. Open the gradient tool. Apply a gradient. Swap the orange color into the gradient
4. While the text is still selected, go to Effect - Pixelate - Color Halftone (you can play around with the size, angles and channels)
5. I added a separate orange outline to the extra copied text as shown

or

you can also look for halftone text plugins as well (Google it) I guess?