title: How can I add cascading drop downs inside of a gridview for edits?
body: <p>I have a fairly standard ASP.NET GridView that displays 2 columns that have a parent child relationship.  Although the relationship exists in the database between column A and column B, the GridView does not implement it.</p>
  
  <p>I would like to do the following:
  When the user has elected to edit the row, 2 dropdown menus become visible.  The DropDownB should automatically be populated with the available options based upon DropDownA's value.  When DropDownA changes, DropDownB needs to be updated to reflect the current options.</p>
  
  <p>Columns currently available to the grid:</p>
  
  <pre><code> - ColumnAID
   - ColumnADescription
   - ColumnBID
   - ColumnBDescription
  </code></pre>
  
  <p>I can certainly accomplish this same functionality outside of the grid, could even have a selected row event display a modal popup allowing me to edit the fields accordingly, but would like to keep this contained to the grid.</p>