Get Gridview Selected Rows using Linq in vb.Net

Hi,

Linq query is not working.came this error

Public member 'Count' on type 'WhereSelectEnumerableIterator(Of GridViewRow,GridViewRow)' not found.

Design:

<asp:TemplateField HeaderText="Select" ItemStyle-HorizontalAlign="Center">
<ItemTemplate>
<asp:CheckBox ID="chkSelect" runat="server" CssClass="css_checkbox" />
</ItemTemplate>
</asp:TemplateField>

Code:

Dim result = From row As GridViewRow In gvGetWorkOrder.Rows
                   Where DirectCast(row.FindControl("chkSelect"), CheckBox).Checked
                   Select gvGetWorkOrder.Rows(row.RowIndex)

If (result.Count() = 0) Then //Public member 'Count' on type 'WhereSelectEnumerableIterator(Of GridViewRow,GridViewRow)' not                                               found.
lblError.Text = "Select atleast any one Work Order"
Exit Sub
Else

End If