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POvalidate textbox text and increase the tab index once
 

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    <p>hi i know where my code is going wrong, but don't know how to fix it...</p> <p>on the TextChanged event, i call my validation function which does (is supposed to do) the following:</p> <ul> <li>remove any non letter character</li> <li>convert the entered letter to upper case</li> <li>only allow one character in the textbox</li> <li>use SendKeys to increase the tab index (go to next textbox)</li> </ul> <p>problem is since it is in the textchanged event, i'm trying to fight it to prevent it from tabbing twice (which it is doing). because the if i step through, the initial letter entered is the first textchanged event, then if it is a notallowedcharacter, the function is called again, but if it is a letter, the ToUpper may be changing it again so tab is getting sent twice. any ideas? i know there's a way to do this without setting up some complex bools....</p> <pre><code>private void validateTextInteger(object sender, EventArgs e) { TextBox T = (TextBox)sender; try { //Not Allowing Numbers, Underscore or Hash char[] UnallowedCharacters = { '0', '1','2', '3', '4', '5','6', '7','8', '9','_','#','%','$','@','!','&amp;', '(',')','{','}','[',']',':','&lt;','&gt;','?','/','=','-','+','\\','|','`','~',';'}; if (textContainsUnallowedCharacter(T.Text, UnallowedCharacters)) { int CursorIndex = T.SelectionStart - 1; T.Text = T.Text.Remove(CursorIndex, 1); //Align Cursor to same index T.SelectionStart = CursorIndex; T.SelectionLength = 0; } } catch (Exception) { } T.Text = T.Text.ToUpper(); if (T.Text.Length &gt; 0) { //how do i prevent this (or this function) from getting called twice??? SendKeys.Send("{TAB}"); } } </code></pre>
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