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Hi ,

I know the coding of two text box values and retrieve it in third text box.


My Question is ,

First Text box:5

Second text box:5

Third text box =10 while entering the first text box value and second text box value, third text box should show the sum of result in 3rd text box automatically.

It should be automatic pop up

Am doing my proj in Windows application, please post the commands related c#.

Help me


Posted 14-Dec-12 19:12pm
Updated 1-Apr-16 23:35pm
adriancs 15-Dec-12 0:25am
What have you tried?
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Solution 1


You can use Textbox Changed event[^]

you need to bind event for both the textbox and make sure if the textbox value is empty then consider it as zero.

Hope you can do it very quickly.

Best luck.
Mohamed Mitwalli 15-Dec-12 0:31am
Hi Amit this will occurred every time he is enter number like if he enter 12345 will occurred 5 times
@AmitGajjar 15-Dec-12 0:33am
Yes, as he said that he need to populate value when he is entering the value in either first or second text box.
@AmitGajjar 15-Dec-12 0:33am
He do not want it at the time of leave the textbox.
Mohamed Mitwalli 15-Dec-12 0:39am
Well take my +5
@AmitGajjar 15-Dec-12 0:42am
Thanks for the 5, Lets wait for response from OP.
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Solution 2

Hi ,
Check this[^]
textBox1_Leave do your calculation in this event

Best Regards
@AmitGajjar 15-Dec-12 0:42am
would you like to change your answer ?

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