c# - Why onTextChanged not working in ASP.net -

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this question has answer here:

i have following textbox in asp.net page:

<asp:textbox ontextchanged="maxchar" id="txtname" width="95%" runat="server"></asp:textbox>

the following in code-behind:

protected void maxchar(object sender, eventargs e) {     if (txtname.text.length > 25)     {         lblisvalid.text = "only 25 characters allowed";     } }

when enter text in textbox , exceed 25 character nothing displayed in label. how can fix it?

in case, max lenght, should use property of asp:textbox called maxlength="25".

but, if want send message user, recomend use jquery, it's easy:

$('#txtname').keydown(function(){      if($(this).length >= 25){         //you alert      };  });

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