How to avoid special characters like alt keywords if user entered accidentally in textbox and it has to throw exception in XML to create winforms

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WINFORM APP

here i have a text box if i entered characters like({,º,º, Ñ, ö ) using alt button the text box has to throw exception with loadxml()

What I have tried:

i used loadxml() to load the XML and i want to know if there is any method that can check the characters alt keywords and other characters

Posted 27-Aug-17 22:15pm

Member 13375990

Updated 27-Aug-17 23:07pm

Graeme_Grant

v3

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Graeme_Grant 28-Aug-17 4:28am

We need a little bit of context as we can't see your screen from here... What type of app are you developing? Winform, Wpf, Xamarin, WebForm, MVC, etc...? Click on the "Improve question" widget and update your question.

Member 13375990 28-Aug-17 4:29am

winforms sir

Graeme_Grant 28-Aug-17 4:44am

If you don't hit the "reply" button on my comment, I don't get alerted to your reply.

I have updated the type of app.

Member 13375990 29-Aug-17 1:26am

the solution not working sir if typed alt+123 "{" is entered how to restrict those keys

Graeme_Grant 29-Aug-17 2:04am

I've given you several different ways of doing it with one example of how you could possibly do it. Now, as a programmer, it is up to you to complete the solution using the method that you find most suitable.

Member 13375990 29-Aug-17 1:29am

and also how to load more data in xml im trying if i used loadxml() only one row is accepting if i used load() multiple rows are accepting data but my task has to use only loadxml() method

Graeme_Grant 29-Aug-17 2:02am

Keyboard handling is one question, loading XML needs to be started in a new question.

Member 13375990 29-Aug-17 3:57am

ok

Richard Deeming 29-Aug-17 8:31am

REPOST
You have already posted this question:
https://www.codeproject.com/Questions/1202829/I-want-to-restrict-the-special-characters-like-quf[^]
https://www.codeproject.com/Messages/5429678/alt-keywords-problem.aspx[^]

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Graeme_Grant · Answer 1 · 2017-08-27T23:07:00

As a "programmer", programming is solving problems.

There are several ways to "validate" user input. Here are two:

1. To disallow invalid input as it is entered - the TextBox's KeyDown event and block invalid value. For example:

C#

private void txtSomeField_KeyDown(object sender, KeyEventArgs e)
{
    e.SuppressKeyPress = e.KeyValue < 34 || e.KeyValue > 127;
}

2. Only enable the SAVE/OK/etc... button if the input is valid

The third option is to check the user input after the SAVE button is pressed.