application

Question

-accept birthday from user it will probably easier to ask year  then month then day rather than parsing string reliably -calculate age of tghe user -check to see if the age of hte user imposible . fo eg: if the user is not born output an errror message . if the user claims to be 135 yrs old then let then know thats not possible -output the age of the user -if it is the user's birthday  output nice messages hint; lookup the system.datetime structure ....

Vulpes · Answer

It's assumed you have 3 textboxes (for year month and day) on your form plus a button to calculate the age. Try adding this code to the button's Click handler: private void button1_Click(object sender EventArgs e) { DateTime dob; try { int year = int.Parse(textBox1.Text); int month = int.Parse(textBox2.Text); int day = int.Parse(textBox3.Text); dob = new DateTime(year month day); } catch // catches any exception { MessageBox.Show(Not a valid date. Please amend); textBox1.Focus(); return; } DateTime today = DateTime.Today; if (today { MessageBox.Show(User hasn't been born yet! Please amend); textBox1.Focus(); return; } int age; if(today.Month > dob.Month || (today.Month == dob.Month && today.Day >= dob.Day)) { age = today.Year - dob.Year; } else { age = today.Year - dob.Year - 1; } if(age >= 135) { MessageBox.Show(User can't be as old as this! Please amend); textBox1.Focus(); return; } string message = Age is  + age; if (today.Month == dob.Month && today.Day == dob.Day) { message += 

Today's your birthday. Many happy returns!; } MessageBox.Show(message); }