how do I add a linkbutton to a gridview at runtime?

Thank you for the suggestion.  However, when I create my gridview I clear all columns in the gridview prior to adding. 
For example:

gvResults.Columns.Clear;  // Clear all columns from the gridview then I begin to add columns as needed

bFld = new BoundField();
bFld.DataField = "brandName";
bFld.HeaderText = "Brand";
 bFld.SortExpression = "brandName";
gvResults.Columns.Add(bFld);

 But, this code does not work:

 LinkButton lb = new LinkButton();

 lb.ID = "lnkEditProduct";
lb.Text = "Edit Item";
 lb.CommandName = "EditProduct";
 lb.CausesValidation = false;
 gvResults.Columns.Add(lb); // the error here is "cannot convert webcontrols.linkbotton to webcontrol.datacontrolfield"

Thanks again!

Hi,

Instead of adding a control dynamically during data-binding, why don't you rather use a ButtonColumn in your GridView? This will create the buttons for you, which will fire an OnRowCommand event when clicked, allowing you to add your objects to your session list (the CommandName property of the EventArgs object of the event will contain the command of the button clicked and CommandArgument will contain the row index).

 
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/* Default.aspx.cs : Code-behind */
namespace ExpertsExchange
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                int[] dataSource = new int[] { 1, 1, 2, 3, 5, 8, 13 };
                gridView1.DataSource = dataSource;
                gridView1.DataBind();
            }
        }
 
        protected void gridView1_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            if (e.CommandName == "AddToSessionList")
            {
                int rowIndex = Convert.ToInt32(e.CommandArgument);
                if (Session["SessionList"] == null)
                    Session["SessionList"] = new List();
                (Session["SessionList"] as List).Add(Convert.ToInt32(gridView1.Rows[rowIndex].Cells[1].Text));
            }
        }
    }
}