How To Edit The Existing Images Using Entitydatasource. I Can Easily Insert Image But Unable To Edit Please Help Me

ImageID int (Prmry key)
PhotoName nvarchar(256)
Photo nvarchar (256)

<asp:Button ID="UpdateButton" runat="server" CommandName="Update" Text="Update" />
<asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Cancel" />
<asp:TextBox ID="PhotoNameTextBox" runat="server" Text='<%# BindItem.PhotoName %>' />
 
<asp:Image ID="Image1" runat="server" ImageUrl='<%# BindItem.Photo %>' Width="135" />


<asp:FileUpload ID="FileUpload1" runat="server" />

Protected Sub EntityDataSource1_Updating(sender As Object, e As EntityDataSourceChangingEventArgs) Handles EntityDataSource1.Updating
Dim ImageID As Integer = Convert.ToInt32(Request.QueryString.Get("ImageID") )
Dim D_Image As D_Image = CType(e.Entity, D_Image)
Dim FileUpload1 As FileUpload = CType(Listview1.InsertItem.FindControl("FileUpload 1"), FileUpload)
Dim VirtualFolder As String = "~/Pics1/"
Dim PhysicalFolder As String = Server.MapPath(VirtualFolder)
Dim Extension As String = System.IO.Path.GetExtension(FileUpload1.FileName)
Dim filename As String = Guid.NewGuid.ToString
Dim Path As String = VirtualFolder + filename + Extension
FileUpload1.SaveAs(System.IO.Path.Combine(Physical Folder, filename + Extension))
D_Image.Photo = Path.ToString
Label1.Text = D_Image.Photo
End Sub