Active Directory: Password Management using SharePoint Webpart.

For Active Directory member the password management is one of the vital functionality which developer needs to add in his efforts to provide a appropriate solution.
Here below is the code snipplet to achieve this functionality.

I have implemented using SharePoint Webpart.

please specify you validation accordingly.
-:Core Code:-
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SPSecurity.RunWithElevatedPrivileges( 
delegate()  
{  
try  
{  
WindowsImpersonationContext aspContext = null; 
WindowsIdentity identity = WindowsIdentity.GetCurrent(); 
aspContext = identity.Impersonate();  
ContextOptions o = ContextOptions.Negotiate; 
PrincipalContext ctx = new PrincipalContext(ContextType.Domain, this._DomainName, this._DomainName Path);


UserPrincipal UPrinci = new UserPrincipal(ctx);
UPrinci  = UserPrincipal.FindByIdentity(ctx, SPContext.Current.Web.CurrentUser.LoginName);
UPrinci.ChangePassword(_oldpassword.Text, _newpassword.Text);  
_labelmsg.Text = "Password changed successfully!" ;  
} //Try
catch (PasswordException ex)  
{ //ex.Message; Catch exception.}
} //Delegate  

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Let me know your comments/ exceptions etc.
Will be glad to get back to you.