_KeyDown event in C# get called twice in windows application

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Hi,

I have to append any alphanumeric keys pressed on form in textbox control in windows application.

I have written code in _Keydown event for form for this, as below

C#

private void DataSummary_KeyDown(object sender, KeyEventArgs e)
{
    txtSearch.Text = txtSearch.Text + e.KeyCode;     
}

If I press any alphanumeric key , txtSearch always contain 2 instances of number.

Actually _KeyDown event in C# get called twice in windows application

Please share your knowledge..

Thanks in advance.

Regards,
Nagraj N

Posted 25-Sep-11 19:08pm

Nagraj Naik

Updated 25-Sep-11 19:11pm

Pravin Patil, Mumbai

v2

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Pravin Patil, Mumbai 26-Sep-11 1:13am

Have you written any TextChanged or Keyup event as well...? Because code seems correct and there is no reason that Keydown event will get fired twice if you are calling it explicitly....

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-09-25T19:16:00

There is no such even as _Keydown. Your DataSummary_KeyDown is just a name of a method, you provide no proof that it is used in the invocation list of the event KeyDown of any control. You also have no proof that it is called twice. Strictly speaking, even is not exactly called, it has a special mechanism for invocation of handlers. You could code millions of clever or stupid things to call the handler twice or just give yourself an impression of such effect. Without looking at your code nothing else can be said.

You could use "Improve question" above and provide correct problem report. However, don't do it just yet.

Simply put a breakpoint at your handler method and see under debugger where it is called from. Use "call stack" debugger window. You will immediately see what's going on. And break the habit of asking any questions before you use debugger.

—SA