protected void btnUpdate_Click(object sender, EventArgs e)
        {
            oStud = new clsStudent();
            lblMessage.Visible = false;
            int i = oStud.ReplacePRN(txtPRN.Text.Trim(), txtReplacePRN.Text.Trim(), user.User_ID);

            if (i > 0)
            {
                lblMessage.Text     = "PRN Repalced";
                lblMessage.CssClass = "saveNote";
                lblMessage.Visible  = true;
            }
            else
            {
                lblMessage.Text     = "Error while replacing PRN";
                lblMessage.CssClass = "errorNote";
                lblMessage.Visible  = true;
            }
        }