title: During PostBack JavaScript losing its functionality
body: <p>I have one GridView which has one CheckBox and three TextBoxes in its template column.
  The logic is, when I check the CheckBox, the corresponding TextBoxes should get enabled. If I uncheck the CheckBox, then the corresponding TextBoxes should get disabled. I have written  JavaScript for this functionality. </p>
  
  <p>Everything is working fine, but in that page I have one DropDownList too. When I change the DropDownList value, the page gets PostBack and at that time I lost the JavaScript functionality, i.e. the enabled TextBoxes in the GridView gets disabled. How to solve this problem?</p>