How to display age in one textbox from dob given in another texbox in vb.net

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there are two textboxes,can we calculate age without any button just by moving from one textbox to another

Posted 8-Oct-14 21:29pm

Member 11137508

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Sinisa Hajnal · Answer 1 · 2014-10-08T21:35:00

Solution 1

Assuming your first textbox contains the date of birth use:

VB

Protected Sub txtDob_Enter(ByVal sender As Object, ByVal e As EventArgs) Handles txtDob.Enter
if isdate(txtBirthDate.Text)
    txtDob.Text = DateDiff(DateInterval.Year, Now, CDate(txtBirthDate.Text)).ToString
End sub

Every time you enter / focus your second textbox, the difference between current time and day of birth will be re-calculated.

This is VB.NET code, but it can easily be translated to C#.

Posted 8-Oct-14 21:35pm

Sinisa Hajnal

Updated 8-Oct-14 22:47pm

v2

Comments

Member 11137508 9-Oct-14 3:41am

Thanks for your quick reply but iam having a doubt which is the id for age textbox and which is for dob ,and where the above code must be placed

Sinisa Hajnal 9-Oct-14 3:59am

txtDob is the id of your second textbox (ona koja sadrži dob - the one containing "dob"). txtBirthDate is your first textbox (which is only my assumption that it is birth date, but it is whatever your originaly entered date is)

The code has to be placed anywhere within your form code (it is just an event handler - as any other sub)

DateDiff calculates the difference between current date and your entered date...if I misunderstood your question, please try to explain again, I'll change my solution to fit.

Member 11137508 9-Oct-14 4:33am

no you have correctly understood but when i placed it in vb code it is giving an error near override

Sinisa Hajnal 9-Oct-14 4:45am

I wrote from memory. Remove the sub, go to txtDob properties, change view to see events and double click on Enter...you should see something very similar to the above with Handles txtDob.Enter at the end.

You can get the same by selecting txtDob in code-view from drop down list of controls on the form and on the right select Enter from event drop down

Sinisa Hajnal 9-Oct-14 4:48am

I've updated the solution with correct event signature

Bhavesh Vankar 5-Apr-21 9:18am

i have used above code to calculate age of person. but its getting me error. Type mismatched when i enter any value in textbox i have wrote this code like as below...

i want to display age in textbox when user enter date of birth in textbox like 01/02/1985. age should be display in textbox. how to do this. ?

Private Sub txtdateofBirth_Change()
If txtcurrentDate.Text Is Date Then
txtdateofBirth.Text = DateDiff(DateInterval.Year, Now, CDate(txtcurrentDate.Text)).ToString
End If
End Sub