Gridview not populating while using a While() structure. C# ASP.Net

Question

I am having problems with this grid view. I am populating it with a query. However, it will not populate or even appear if I use a while(reader.Read()) structure. Without the

Answer 1

The SqlDataReader is forward-only. When you first iterate over the rows, there is "nothing left" in it to display afterwards.

I suggest that you use the reader to populate a strongly-typed list in memory, and then bind the GridView to the list instead. Example:

var myList = new List();
while (myReader.Read())
{
    myList.Add(new TicketInfo
    {
        TicketCost = Convert.ToDecimal(myReader["TicketCost"]),
        NumTickets = Convert.ToInt32(myReader["NumTickets"])
    });
}
grdEvents.DataSource = myList;
grdEvents.DataBind();

The code example above assumes that you have a class called TicketInfo defined as:

class TicketInfo
{
    public decimal TicketCost { get; set; }
    public int NumTickets { get; set; }
}

If you haven't used generics (such as List in the example) before, I suggest you do some reading on the subject.