This code allows you to enter only maximum characters.
<body> <form id="form1" runat="server"> <div> <asp:TextBox ID="CharacterCountTextBox" TextMode="multiLine" MaxLength="100"
runat="server"onkeyup="javascript:CharCounter(this.id);"
onblur="javascript:CharCounter(this.id);"></asp:TextBox>
<asp:Label ID="MessageLabel" runat="server" Text="100 chars remaining">
</asp:Label> </div> </form> </body>
Place this script in the header tag.<script language="javascript" type="text/javascript"> function CharCounter(CharacterCountTextBox) { var totalchar = '<%= CharacterCountTextBox.MaxLength %>'; var txtbox = document.getElementById(CharacterCountTextBox); var lbl = document.getElementById('<% =MessageLabel.ClientID %>'); if (txtbox.value.length > totalchar) { txtbox.value = txtbox.value.substring(0, totalchar); } lbl.innerText = (totalchar - txtbox.value.length) + " chars remaining"; } </script>
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