Disable/Enable the UI Controls using JavaScript in Asp.Net

In Design  

  

<asp:CheckBox ID="chkEnable" runat="server" Text="Enable" onclick="MakeEnable()" />

<asp:TextBox ID ="txtName" runat="server"></asp:TextBox>  

In JavaScript

<script type="text/javascript" >

       function MakeEnable() {

           if (document.getElementById('<%= chkEnable.ClientID %>').checked) {

               document.getElementById('<%= txtName.ClientID %>').disabled = true;

           }

           else {

               document.getElementById('<%= txtName.ClientID %>').disabled = false;

           }

      }

 </script>

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