Data source is an invalid type. It must be either an IListSource, IEnumerable, or IDataSource

Question

Data source is an invalid type. It must be either an IListSource, IEnumerable, or IDataSource. The error is displayed when I bind the grid view

var list = d         


        

Answer 1

In my testing page I make us of the following piece of code to display a list of different objects or just a single object in the same gridview.

   var data = bl.getAirlines();
   // If single object returned cast to List
   // Note that could be already a list of 1 item though!
    if (data.Count == 1)
    {
        var list = new List