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Message: [QUOTE="Guest, post: 449545"] Try this... <HTML> <script language="javascript"> function myCB_CheckedChanged() { if (document.getElementById("myCB").checked == true) document.getElementById("myDDL").disabled = false; else document.getElementById("myDDL").disabled = true; } </script> <body> <form id="Form1" method="post" runat="server"> <asp:CheckBox id="myCB" onclick="myCB_CheckedChanged();" runat="server" Text="My Check Box" Checked=True /> <br> <asp:DropDownList id="myDDL" runat="server"/> </form> </body> </HTML> [/QUOTE]