How to acces Key Value of GridView

Protected Sub ImgDelete_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs)
Try

Dim ImgBtn As ImageButton = DirectCast(sender, ImageButton)

Dim row As DevExpress.Web.ASPxGridView.GridViewDataItemTemplateContainer
row = TryCast(ImgBtn.NamingContainer, DevExpress.Web.ASPxGridView.GridViewDataItemTemplateContainer)
lblEmp.Text = gvShiftWorkingEmp.GetRowValues(row.ItemIndex, "Emp Name")
LblShiftDate.Text = Convert.ToDateTime(gvShiftWorkingEmp.GetRowValues(row.ItemIndex, "Date")).ToString("dd-MMM-yyyy")
lblOldShiftCode.Text = gvShiftWorkingEmp.GetRowValues(row.ItemIndex, "shift_Code")
HiddenField1.Value = row.KeyValue.ToString
ModalPopupExtender1.Show()
Catch ex As Exception
lblMsg.Text = "Error on delete."
CommonCGDNA.AddToErrorLog(ex)
lblMsg.Visible = True
End Try
End Sub