delete gridview row Programmatically - asp.net

Question

I keep returning an error when trying to delete a row in my gridview (Input string was not in a correct format)
Not sure what I'm doing wrong. Any help?
<asp:GridView ID="favoritesGrid" runat="server" OnRowDeleting ="favoritesGrid_RowDeleting">
<columns>
<asp:CommandField HeaderText="Delete" ShowDeleteButton="True"/>
<asp:BoundField HeaderText="FavoritesId" DataField="FavoritesId"/>
<asp:TemplateField HeaderText="Site Name">
<ItemTemplate>
<asp:HyperLink ID="myHyperlink"
Text='<%# Eval("SiteName") %>'
NavigateUrl='<%# Eval("Url") %>'
runat="server">
</asp:HyperLink>
</ItemTemplate>
</asp:TemplateField>
</columns>
</asp:GridView>
protected void favoritesGrid_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
var delId = Convert.ToInt32(favoritesGrid.Rows[e.RowIndex].Cells[0].Text);
//var id = favoritesGrid.Rows[e.RowIndex].Cells[0].Text;
var delFavorites = new FavoritesDb();
var delFavs = delFavorites.DeleteFavorite(delId);
DataBind();
}

Answer 1

The cell at position 0 has the word "delete" in it and it cannot be converted to int.
You need to use:
var delId = Convert.ToInt32(favoritesGrid.Rows[e.RowIndex].Cells[1].Text);
However, this is not a good approach since you might change the cells order or add a new one. You'd better use the DataKeyNames attribute.
aspx:
<asp:GridView DataKeyNames="FavoritesId" ...>
C#:
Convert.ToInt32(favoritesGrid.DataKeys[e.RowIndex].Value);