I need to add capital lettors only in textbox?

Refer these links

http://www.dotnetspider.com/forum/298319-Regular-expression-capital-letters.aspx[^]

http://geekswithblogs.net/brcraju/articles/235.aspx[^]

Hi,

You can do it by applying CSS to the text box.

like,

<style>
.upper
{
	text-transform:uppercase ;
}
</style>

then calling Css in Text box,

<asp:textbox id="txtName" runat="server" cssclass="upper" xmlns:asp="#unknown"></asp:textbox>

regards,
Pal

<asp:textbox id="txtInput" runat="server" xmlns:asp="#unknown"></asp:textbox>
 <script type="text/javascript">   
  function setFormat() 
{     
    var inp = document.getElementById('ctl00_MainContent_txtInput'); 
    var x = inp.value;      
    inp.value = x.toUpperCase();   
  }      
var inp = document.getElementById('ctl00_MainContent_txtInput');
     inp.onblur = function(evt) {  
       setFormat();     
}; 
</script>

Just try this:

<pre lang="HTML"><asp:TextBox ID="txtName" runat="server"/>
<asp:FilteredTextBoxExtender ID="fteLName" TargetControlID="txtName"
runat="server" FilterType="UppercaseLetters"
ValidChars=" "/></pre>

FilteredTextBoxExtender is a tool of ajax control toolkit..
All the best.. :)