Text Box Characters Counter

In almost all the web projects, we require a multiline TextBox control. It was annoying to find that maxLength property doesn’t work on multiline textboxes.

There are various ways to solve this issue, here i am using javascript to restrict user once he reach maxlimit.

<script type=”text/javascript” language=”javascript”>

function validatelimit(obj, maxchar)

if(this.id) obj = this;

var remaningChar = maxchar – obj.value.length;
document.getElementById(‘<%= Label1.ClientID %>’).innerHTML = remaningChar;

if( remaningChar <= 0)
obj.value = obj.value.substring(maxchar,0);
return false;

{return true;}



<asp:TextBox ID=”TextBox1″ runat=”server” TextMode=”MultiLine” onkeyup=”return validatelimit(this,500)” Height=”400px”></asp:TextBox>
<asp:Label ID=”Label1″ runat=”server” Text=”500″></asp:Label>

Other useful links :


Hope this will Help u.


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