Calculate Age based on date and display it as Days and Months using C#

Ok Vasanth you can try this

 protected void OnCalculateAge(object sender, EventArgs e)
        {
            DateTime dateOfBirth = new DateTime();
            int currentYear, currentMonth, birthMonth, birthYear, years, months;
            dateOfBirth = Convert.ToDateTime(txtDateOfBirth.Text);
            currentYear = Convert.ToInt32(DateTime.Now.Year);
            currentMonth = Convert.ToInt32(DateTime.Now.Month);
            birthYear = Convert.ToInt32(dateOfBirth.Year);
            birthMonth = Convert.ToInt32(dateOfBirth.Month);
            years = currentYear - birthYear;
            if ((currentMonth - birthMonth > 0))
            {
                months = Convert.ToInt32(currentMonth - birthMonth);
            }
            else
            {
                years = years - 1;
                months = Convert.ToInt32((12 - birthMonth) + currentMonth);
            }
            txtAge.Text = years.ToString() + "/" + months.ToString();
        }