I am 29 years old and my height is 5ft 10 inches and my weight is only 52 kg. kindly suggest how can i improve my weight?......

Underweight: First consider a thoroght physical exam to make sure there are no medical reasons for you being underweight.

Eat healthy foods: high in calories. Eat 6 meals /day. Work on strength training to build large muscle groups. Work out w heavier weights w fewer repetitions. Sleep at least 8 - 9 hrs/night. Hydrate well w water. Foods to help w weight gain: almonds, cashews, pecans, sunflower seeds, flax seeds, walnuts, hummus, avocados, granola, trail mix, dried fruits, protein shakes & bars, lean meats, poultry, fish, smoothies