Question

I have a GridView and on a row being deleted I trigger the GridView1_RowDeleting sub, but I receive an error “LINQ to Entities does not recognize the method ‘System.Web.UI.WebControls.TableCell get_Item(Int32)’ method, and this method cannot be translated into a store expression.” Code is:

Private Sub GridView1_RowDeleting(sender As Object, e As System.Web.UI.WebControls.GridViewDeleteEventArgs) Handles GridView1.RowDeleting
    ' The deletion of the individual row is automatically handled by the GridView.
    Dim dbDelete As New pbu_housingEntities
    ' Remove individual from the bed.
    Dim remove_bed = From p In dbDelete.Beds _
                     Where p.occupant = GridView1.Rows(e.RowIndex).Cells(3).Text _
                     Where p.room = GridView1.Rows(e.RowIndex).Cells(6).Text _
                     Where p.building = GridView1.Rows(e.RowIndex).Cells(5).Text _
                     Order By p.id Descending _
                     Select p

    remove_bed.First.occupant = ""
    dbDelete.SaveChanges()

    ' Increase number of open spaces in room.
    Dim update_occupancy = From p In dbDelete.Rooms _
                           Where p.room1 = GridView1.Rows(e.RowIndex).Cells(6).Text
                           Where p.building = GridView1.Rows(e.RowIndex).Cells(5).Text _
                           Select p

    update_occupancy.First.current_occupancy = update_occupancy.First.current_occupancy - 1
    dbDelete.SaveChanges()

End Sub

The specific line erroring out is:

remove_bed.First.occupant = ""

Answer 1

That’s because the Linq query is translated to SQL, and there is no way to translate GridView1.Rows(e.RowIndex).Cells(3).Text to SQL. You need to extract the values from the GridView, then use them in the query

Dim occupant As String = GridView1.Rows(e.RowIndex).Cells(3).Text
Dim room As String = GridView1.Rows(e.RowIndex).Cells(6).Text
Dim building As String = GridView1.Rows(e.RowIndex).Cells(5).Text
Dim remove_bed = From p In dbDelete.Beds _
                 Where p.occupant = occupant _
                 Where p.room = room _
                 Where p.building = building _
                 Order By p.id Descending _
                 Select p