I have a linkbutton server control in my page whose Enabled attribute is initially set to "false". When a text box's text changes I would like to enable the linkbutton. I tried the following but it does not work. Could you let me know if i am missing something. function TextBox_TextChanged() { var control = $get("<%= linkButtonSave.ClientID%>"); if(control != null) control.enabled = true; } Thanks