How can i display image on VGA using DE2-115 Altera board

Really? If I google 'vga verilog' I get literally hundreds of different pages that describe various vga image generators written in verilog.

The Terasic user manual has a pretty good writeup on VGA signal timing, and the VGA hardware interface on the DE2-115 board (v2.1, section 4.10, pp 51-53).

Given the resources available on the net writing up a simple module in verilog (or vhdl) should be pretty easy to accomplish.