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POSIP: Key.Shift not getting detected
 

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    <p>I am trying to create a text box which accepts only alphabets and numbers, and discards all the special characters. I need this for entering a valid file name, without extension. I am using the following code:</p> <pre><code>private void txtFName_KeyDown(object sender, KeyEventArgs e) { if (!(((e.Key &gt;= Key.A) &amp;&amp; (e.Key &lt;= Key.Z)) || ((e.Key &gt;= Key.D0) &amp;&amp; (e.Key &lt;= Key.D9)) || (e.Key == Key.Shift) || (e.Key == Key.Back))) { e.Handled = true; MessageBox.Show("No Special Characters are Allowed!"); } } </code></pre> <p>Unfortunately the "KeyPress" event is not there, so I figured out that this is the best way to achieve what I am doing.</p> <p>The problem I am facing is:</p> <p>As you can see in the code above, I have taken care of the "Shift" key press, but when I press the "Shift" key on the SIP, the "No Special Characters are Allowed" Message box pops up 3 times before I can key in an upper case alphabet!!! So this essentially prevents me from entering any Upper case characters. </p> <p>Worse still, it is accepting all the characters !@#$%^&amp;*(). Probably because it is detecting these as numbers from 0-9. It looks that the key codes are being returned the same for 2 and @, 3 and # and so on. This is very strange behavior! And I can not even use the underscore key with the above technique. </p> <p>Such behavior is obviously not acceptable in a professional App.</p> <p>How can I create a text box which accepts only alphabets, numbers and underscore, and discards all other characters? Also, is there a problem with the "Shift" key not getting detected?</p>
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