Image control in Item Template gridview

HiddenField hdnPriority = (e.Row.Items[1].FindControl(Constants.HiddenFieldPriority) as HiddenField);
                HiddenField hdnRead = (e.Row.Items[2].FindControl(Constants.HiddenFieldRead) as HiddenField);
                Image imgRead = null;
                imgRead = (e.Row.Items[2].FindControl(Constants.ImageRead) as Image);
                Image imgPriority = null;
                imgPriority = (e.Row.Items[1].FindControl(Constants.ImagePriority) as Image);

                ////Bold Unbold Logic.
                if (hdnPriority.Value.ToString() != Constants.High && hdnRead.Value.ToString() == String.Empty && lstMail.SelectedIndex != 1)
                {
                    e.Row.CssClass = Constants.Bold_Font;

                    imgRead.Visible = true;
                    imgRead.ImageUrl = "~/Images/IsNew.jpg";
                    imgPriority.Visible = true;
                    imgPriority.ImageUrl = "~/Images/Transparent.jpg";


                }

                else if (hdnPriority.Value.ToString() != Constants.High && hdnRead.Value.ToString() != String.Empty && lstMail.SelectedIndex != 1)
                {
                    e.Row.CssClass = Constants.UnBold_Font;

                    imgRead.Visible = true;
                    imgRead.ImageUrl = "~/Images/IsOpen.png";

                    imgPriority.Visible = true;
                    imgPriority.ImageUrl = "~/Images/Transparent.jpg";


                }

                ////Bold Unbold Logic For High Priority Email.
                else if (hdnPriority.Value.ToString() == Constants.High && hdnRead.Value.ToString() == String.Empty && lstMail.SelectedIndex != 1)
                {
                    e.Row.CssClass = Constants.Bold_High_Font;

                    imgPriority.Visible = true;
                    imgPriority.ImageUrl = "~/Images/High.png";


                    imgRead.Visible = true;
                    imgRead.ImageUrl = "~/Images/IsNew.jpg";

                }

                else if (hdnPriority.Value.ToString() == Constants.High && hdnRead.Value.ToString() != String.Empty && lstMail.SelectedIndex != 1)
                {
                    e.Row.CssClass = Constants.UnBold_High_Font;

                    imgPriority.Visible = true;
                    imgPriority.ImageUrl = "~/Images/High.png";


                    imgRead.Visible = true;
                    imgRead.ImageUrl = "~/Images/IsOpen.png";

                }