I have just recently started using Infragistics. I am using UltraWinGrid.v8.3. How do I find the AllowMultiCellOperation Property? I would like to allow the user to copy and paste multiple rows. 

AllowMultiCellOperation is on the Override object. So if you want to set it for the whole grid, you should use the InitializeLayout event of the grid and do something like this:

e.Layout.Override.AllowMultiCellOperation = AllowMultiCellOperation.All

 I tried adding rows to the DataTable and and allowing the multicelloperation. In my case, adding rows to the datatable provides the desired functionality. I had some problems casting the UltraGridRow to a DataRow but I found the solution in another post.

Thanks to everyone for your help.