Instance 365 (3) --------- DateDiff function, get the age by birthday

I:

Ii. Code

Using System; using System. collections. generic; using System. componentModel; using System. data; using System. drawing; using System. linq; using System. text; using System. windows. forms; using Microsoft. visualBasic; namespace GetAge {public partial class Frm_Main: Form {public Frm_Main () {InitializeComponent ();} private void btn_GetAge_Click (object sender, EventArgs e) {long P_BirthDay = DateAndTime. dateD Iff (DateInterval. Year, // age dtpicker_BirthDay.Value, DateTime. Now, FirstDayOfWeek. Sunday, FirstWeekOfYear. Jan1);/* parameter description * Interval is required. The DateInterval enumerated value or String expression, indicating the time interval of the Unit for the difference between Date1 and Date2. Date1 is required. Date. The first date/time value to be used in the calculation. Date2 is required. Date. The second date/time value to be used in the calculation. Optional. Value selected from the FirstDayOfWeek enumeration, used to specify the first day of a week. If not specified, use FirstDayOfWeek. Sunday. WeekOfYear is optional. Value selected from the FirstWeekOfYear enumeration. This enumeration is used to specify the first week of the year. If not specified, use FirstWeekOfYear. Jan1. */MessageBox. Show (string. Format ("Age: {0} years old. ", // Output age information P_BirthDay.ToString ()," prompt! ");}}}