Populate ListView with data from server - asp.net

Question

I have a ListView on my checkout page with an ItemTemplate which build up a table of items ordered by customer. I want to add a total in the footer of the table, I have the following markup:
<asp:ListView ID="lvOrderSummary" runat="server">
<LayoutTemplate>
<table id="tblOrderSummary">
<tr>
<td><b>Title</b></td>
<td><b>Cost</b></td>
</tr>
<asp:PlaceHolder ID="itemPlaceholder" runat="server" />
<tr>
<td><b>Total Cost:</b></td>
<td><%# GetTotalCost().ToString()%></td>
</tr>
</table>
</LayoutTemplate>
<ItemTemplate>
<tr>
<td><%#Eval("Title") %></td>
<td><%#Eval("Cost") %> </td>
</tr>
</ItemTemplate>
</asp:ListView>
I have a server side method called GetTotalCost that return the value I require. The problem I'm having is that this method is never called.
I have also tried and instead of using:
<td><%# GetTotalCost().ToString()%></td>
I've tried using
<td id="tdTotal" runat="server"></td>
---------------
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
TableCell td = ((TableCell)this.FindControl("lvOrderSummary_tdTotal"));
}
}

Answer 1

Check this article for an example how to display a total in the ListView.
Basically you can add a label in the layout template:
<asp:ListView ID="lvOrderSummary" runat="server"
OnPreRender="lvOrderSummary_PreRender" ...>
<LayoutTemplate>
...
<td><asp:Label ID="lblTotalCost" runat="server" Text="Total"/></td>
..
</LayoutTemplate></asp:ListView>
And then you set the label's text in the PreRender event handler:
protected void lvOrderSummary_PreRender(object sender, EventArgs e)
{
Label lbl = lvOrderSummary.FindControl("lblTotalCost") as Label;
lbl.Text = GetTotalCost().ToString();
}

Answer 2

Try
Dim strcon As String = "Data Source=.\SQLEXPRESS;AttachDbFilename=D:\webarticles\App_Data\mydatabase.mdf;Integrated Security=True;User Instance=True"
Dim con As New SqlConnection(strcon)
con.Open()
Dim da As SqlDataAdapter
Dim ds As New DataSet
Dim sqlstring As String = "SELECT * FROM tblstudent "
da = New SqlDataAdapter(sqlstring, con)
da.Fill(ds)
DetailsView1.DataSource = ds.Tables(0)
DetailsView1.DataBind()
Catch ex As Exception
MsgBox("There is some Error")
End Try
Another data handeling control is DetailsView control which gives you the ability to display, delete, edit, insert a single record at a time from its associated data source. The DetailsView control does not support sorting.By default, the DetailsView control displays each field of a record on its own line.