Convert Text to Uppercase while typing in Text box

Question

I am new in Visual Studio and using visual Studio 2008  In a project I want to make all text in uppercase while typed by the user without pressing shift key or caps lock on  I have used this code  TextBox1 Text   TextBox1 Text ToUpper      but it capitalize characters after pressing Enter key   I just want that characters appear in uppercase while typing by the user without pressing shift key or without caps lock on   Total page code is as     public partial class Test   System Web UI Page         protected void Page Load object sender  EventArgs e                   protected void TextBox1 TextChanged object sender  EventArgs e                TextBox1 Text   TextBox1 Text ToUpper               Have any one any solution  please guide me

User · Answer

set your CssClass property in textbox1 to  cupper   then in page content create new css class     lt style type  text css  gt  cupper  text-transform uppercase   lt  style gt    Then  enjoy it

User · Answer

if you can use LinqToObjects in your Project  private YourTextBox TextChanged   object sender  EventArgs e       return YourTextBox Text Where c  gt  c ToUpper         An if you can t use LINQ  e g  your project s target FW is  NET Framework 2 0  then  private YourTextBox TextChanged   object sender  EventArgs e       YourTextBox Text   YourTextBox Text ToUpper        Why Text Changed Event     There are few user input events in framework    1-  OnKeyPressed fires  starts to work  when user presses to a key from keyboard after the key pressed and released  2-  OnKeyDown fires when user presses to a key from keyboard during key presses  3-  OnKeyUp fires when user presses to a key from keyboard and key start to release  user take up his finger from key   As you see  All three are about keyboard event  So what about if the user copy and paste some data to the textbox   if you use one of these keyboard events then your code work when and only user uses keyboard  in example if user uses a screen keyboard with mouse click or copy paste the data your code which implemented in keyboard events never fires  never start to work   so  and Fortunately there is another option to work around   The Text Changed event    Text Changed event don t care where the data comes from  Even can be a copy-paste  a touchscreen tap  like phones or tablets   a virtual keyboard  a screen keyboard with mouse-clicks  some bank operations use this to much more security  or may be your user would be a disabled person who can t press to a standard keyboard  or a code-injection        No Matter    Text Changed event just care about is there any changes with it s responsibility component area   here  Your TextBox s Text area  or not    If there is any change occurs  then your code which implemented under Text changed event works

User · Answer

I use to do this thing  Code Behind  ASP NET using VB NET   1  Turn AutoPostBack   True in properties of said Textbox  2  Code for Textbox  Event   TextChanged     Me TextBox1 Text   Me TextBox1 Text ToUpper  3  Observation    After entering the string variables in TextBox1  when user leaves TextBox1      AutoPostBack fires the code when Text was changed during  TextChanged  event

User · Answer

Css Class      upCase       text-transform  uppercase      lt asp TextBox ID  TextBox1  runat  server  Text  abc  Cssclass  upCase  gt  lt  asp TextBox gt

User · Answer

I had the same problem with Visual Studio 2008 and solved adding the following event handler to the textbox           private void textBox1 KeyPress object sender  KeyPressEventArgs e                if   e KeyChar  gt    a    amp  amp   e KeyChar  lt    z                          int iPos   textBox1 SelectionStart              int iLen   textBox1 SelectionLength              textBox1 Text   textBox1 Text Remove iPos  iLen  Insert iPos  Char ToUpper e KeyChar  ToString                 textBox1 SelectionStart   iPos   1              e Handled   true                    It works even if you type a lowercase character in a textbox where some characters are selected  I don t know if the code works with a Multiline textbox

User · Answer

There is a specific property for this  It is called CharacterCasing and you could set it to Upper    TextBox1 CharacterCasing   CharacterCasing Upper    In ASP NET you could try to add this to your textbox style    style  text-transform uppercase     You could find an example here  http   www w3schools com cssref pr text text-transform asp

User · Answer

Edit  for ASP NET   After you edited your question it s cler you re using ASP NET  Things are pretty different there  because in that case a roundtrip to server is pretty discouraged   You can do same things with JavaScript  but to handle globalization with toUpperCase   may be a pain  or you can use CSS classes  relying on browsers implementation   Simply declare this CSS rule    upper-case       text-transform  uppercase     And add upper-case class to your text-box    lt asp TextBox ID  TextBox1  CssClass  upper-case  runat  server   gt    General  Old  Answer     but it capitalize characters after pressing Enter key    It depends where you put that code  If you put it in  for example  TextChanged event it ll make upper case as you type   You have a property that do exactly what you need  CharacterCasing   TextBox1 CharacterCasing   CharacterCasing Upper    It works more or less but it doesn t handle locales very well  For example in German language    is SS when converted in upper case  Institut f  r Deutsche Sprache  and this property doesn t handle that   You may mimic CharacterCasing property adding this code in KeyPress event handler   e KeyChar   Char ToUpper e KeyChar     Unfortunately  NET framework doesn t handle this properly and upper case of sharp s character is returned unchanged  An upper case version of    exists and it s   and it may create some confusion  for example a word containing  ss  and another word containing      can t be distinguished if you convert in upper case using  SS    Don t forget that      However  in 2010 the use of the capital sharp s became mandatory in official documentation when writing geographical names in all-caps    There isn t much you can do unless you add proper code for support this  and others  subtle bugs in  NET localization  Best advice I can give you is to use a custom dictionary per each culture you need to support   Finally don t forget that this transformation may be confusing for your users  in Turkey  for example  there are two different versions of i upper case letter   If text processing is important in your application you can solve many issues using specialized DLLs for each locale you support like Word Processors do   What I usually do is to do not use standard  NET functions for strings when I have to deal with culture specific issues  I keep them only for text in invariant culture   I create a Unicode class with static methods for everything I need  character counting  conversions  comparison  and many specialized derived classes for each supported language  At run-time that static methods will user current thread culture name to pick proper implementation from a dictionary and to delegate work to that  A skeleton may be something like this   abstract class Unicode       public static string ToUpper string text                return GetConcreteClass   ToUpperCore text              protected virtual string ToUpperCore string text                   Default implementation  overridden in derived classes if needed         return text ToUpper               private Dictionary lt string  Unicode gt   implementations       private Unicode GetConcreteClass                 string cultureName   Thread Current CurrentCulture Name              Check if concrete class has been loaded and put in dictionary                      return  implementations cultureName             I ll then have an implementation specific for German language   sealed class German   Unicode       protected override string ToUpperCore string text                   Very naive implementation  just to provide an example         return text ToUpper   Replace                       True implementation may be pretty more complicate  not all OSes supports upper case    but take as a proof of concept  See also this post for other details about Unicode issues on  NET

[c#] Convert Text to Uppercase while typing in Text box

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