The incident happened when Anuj Garg was returning from shop late on Saturday night when the incident occurred.
"When Anuj was getting out of his car, the four armed assailants who arrived in a car held him at gunpoint and asked him to hand over his bag containing over Rs one lakh," a senior police officer said.
When Garg tried to resist, they opened fire at him, the officer said, adding that hearing the gunshot, Garg's wife Deepa rushed outside the house and found some assailants attacking her husband.
Police said Anuj sustained a bullet injury on his back while his wife suffered a bullet wound on her leg. The couple has been admitted to Sarvodaya Hospital in Ghaziabad.
Sleuths are probing the case and a manhunt has been launched to arrest the four accused.