如何在修改密碼時給給文本框賦值爲****

<!-- /* Font Definitions */ @font-face{font-family:新細明體;panose-1:2 2 3 0 0 0 0 0 0 0;mso-font-alt:PMingLiU;mso-font-charset:136;mso-generic-font-family:roman;mso-font-pitch:variable;mso-font-signature:3 137232384 22 0 1048577 0;}@font-face{font-family:"/@新細明體";panose-1:2 2 3 0 0 0 0 0 0 0;mso-font-charset:136;mso-generic-font-family:roman;mso-font-pitch:variable;mso-font-signature:3 137232384 22 0 1048577 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal{mso-style-parent:"";margin:0cm;margin-bottom:.0001pt;mso-pagination:none;font-size:12.0pt;font-family:"Times New Roman";mso-fareast-font-family:新細明體;mso-font-kerning:1.0pt;} /* Page Definitions */ @page{mso-page-border-surround-header:no;mso-page-border-surround-footer:no;}@page Section1{size:612.0pt 792.0pt;margin:72.0pt 90.0pt 72.0pt 90.0pt;mso-header-margin:36.0pt;mso-footer-margin:36.0pt;mso-paper-source:0;}div.Section1{page:Section1;}-->txtPassword.Attributes.Add("value","密碼")