asp.net membership 密码重设

<connectionstrings>
<add name="sqlservices" connectionstring="server=.;database=data;uid=sa;pwd=123;" />
</connectionstrings>

<membership defaultprovider="sqlprovider" userisonlinetimewindow="15">
<providers>
<clear/>
<add name="sqlprovider"
type="system.web.security.sqlmembershipprovider"
connectionstringname="sqlservices"
applicationname="dev"
enablepasswordretrieval="false"
enablepasswordreset="true"
requiresquestionandanswer="false"
requiresuniqueemail="false"
passwordformat="hashed"
minrequiredpasswordlength="1"
minrequirednonalphanumericcharacters="0"
/>
</providers>
</membership>

membershipuser mem = membership.getuser(this.lblusername.text);
string p = mem.resetpassword();
mem.changepassword(p, "123456");