On KeyPress or KeyUp event, how can I do something like this:
if (String.IsOnlyANumber(textBox.Text))
{
do my things
}
else if(String.IsLettersAndEverythingElse(textBox.Text))
{
do my other things
}
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Wai Ha Lee
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2Duplicate of: [how to check if the character is an integer](https://stackoverflow.com/questions/12866214/how-to-check-if-the-character-is-an-integer), [How do I make a textbox that only accepts numbers?](https://stackoverflow.com/q/463299/8967612) – 41686d6564 stands w. Palestine Oct 29 '20 at 07:27
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@41686d6564 why did you change the link? the last one was better – James Jefferson Johnson Oct 29 '20 at 08:03
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I didn't change the link. There are two links in my comment. The first post tells you how to check if a char is a digit and the second one tells you how to _get_ the char (in case you didn't know how) in the `KeyPress` event. – 41686d6564 stands w. Palestine Oct 29 '20 at 08:06
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@41686d6564 sorry, my bad. Didn't saw it :D struggling hard in the mornings – James Jefferson Johnson Oct 29 '20 at 08:09
2 Answers
0
private void your_textBox_KeyPress(object sender, KeyPressEventArgs e)
{
if (char.IsDigit(e.KeyChar))
{
// is a number
}
else
{
// is anything else
}
}
juergen d
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-1
try this,
textBox1.Text = string.Concat(textBox1.Text.Where(char.IsLetterOrDigit));
in your KeyPress or KeyUp event.
Swapnil Hendre
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