For the detailed information, please refer to the following URL.
Setting a TextBox Web Server Control for Password Entry http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon/html/
vbtsksettingtextboxwebcontrolforpasswordentry.asp
"...
A TextBox Web server control set for passwords hides a user's entry as it
is being typed. Password text boxes can only be single-line text boxes.
..."
I hope it helps.
Best regards,
Jacob Yang
Microsoft Online Partner Support
Get Secure! ¨C www.microsoft.com/security
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