show error message on keypress event in textbox

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C#

private void txtzip_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (char.IsLetter(e.KeyChar))
            {
                MessageBox.Show("Hi");
            }
        }

i used above coding to show message when user type wrong thing which is not match above condition but its not working ., i also given keypreview=true

Posted 23-Sep-12 20:00pm

Umapathi K

Updated 23-Sep-12 20:13pm

v3

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Shambhoo kumar 24-Sep-12 2:07am

what ur true condition ,ur question is not clear..plz describe..

Umapathi K 24-Sep-12 2:12am

not working

2 solutions

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D-Kishore · Answer 1 · 2012-09-23T20:10:00

Solution 1

Hello dear,
use this code, it will work

C#

if (char.IsLetter(e.KeyChar))
            {
                MessageBox.Show("Hi");
            }

Posted 23-Sep-12 20:10pm

D-Kishore

Comments

Umapathi K 24-Sep-12 2:12am

not working

dmunisubbu 24-Sep-12 2:13am

yes its correct, he is using "!" Symbol. because of that loop is terminating.
remove "!" and try it will work as kishore said.

D-Kishore 24-Sep-12 2:18am

Make keypriview=false and try once

Abhijit Parab · Answer 2 · 2012-09-23T20:13:00

Solution 2

Hi,
try This one.

http://www.daniweb.com/software-development/vbnet/threads/114278/textbox-key-press-event[^]

Posted 23-Sep-12 20:13pm

Abhijit Parab