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POOnly allow digits in textbox C#
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2013-02-05T01:46:44.007
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2013-02-04T23:10:13.963
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2017-05-23T12:29:35.723
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Body
<blockquote> Possible Duplicate: <a href="https://stackoverflow.com/questions/2882369/how-can-i-allow-only-0-or-1-to-be-entered-in-a-textbox">How can I allow only 0 or 1 to be entered in a TextBox?</a> <a href="https://stackoverflow.com/questions/11656217/allow-only-integers-in-textboxes">Allow only integers in TextBoxes</a> </blockquote> I'm working on a program now and I have a few simple <code>textboxes</code>. I keep getting an error when the input of the <code>textbox</code> is NOT a number, because it tries to convert it to a integer. The code is very basic: <pre><code> int optelNumber = Convert.ToInt32(textBox2.Text); MessageBox.Show("Please enter a digit."); //if optelNumber is not a digit </code></pre> for example: <pre><code>input in textbox = "Hello !" => pops up the Mess.Box input in textbox = 123245 => keep running the program </code></pre> Hope this is enough information. I've searched almost all other topics but all the code was to advanced for me. :( Thanks for your time <ul> <li>edit : </li> </ul> The <code>messagebox</code> is to catch the error and keep the program from crashing. <ul> <li>edit : <pre><code>int vedett = 0, duvel = 0, kDuvel = 0, kriek = 0, pils = 0; //only digits allowed here int optelNumber = Convert.ToInt32(textBox2.Text); switch(comboItem) { case "vedett": vedett += optelNumber; break; case "duvel": duvel += optelNumber; break; case "kl. duvel": kDuvel += optelNumber; break; case "pils": pils += optelNumber; break; case "kriek": kriek += optelNumber; break; case "": MessageBox.Show("Kies een andere drank."); break; } </code></pre></li> </ul>
Tags
<c#><textbox><digits>
Title
Only allow digits in textbox C#
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1. PTQuestion
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1. USNick Peelman
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1. PO
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1. COI don't know if this is want you need, but may help http://blog.csharphelper.com/2012/11/20/throw-standard-exceptions-in-c.aspx
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 POOnly allow digits in textbox C#
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 USCesar A. Rivas

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