protected void DeleteLinkButton_Click(object sender, EventArgs e)
    {
        UserBO ob = new UserBO();

        ob.coursecode = Session["selectedGrid"].ToString();

        clsBLL obj = new clsBLL();

        obj.DeleteCourseBLL(ob);

        Editor.Visible  = false;
        Viewer.Visible  = false;
        Deleted.Visible = true;
    }