By default, the PasswordChar property is -107, which indicates the code for the black circle character. The Password property specifies whether the control the control displays a black circle for any shown character. For instance, Mask on ";;;password", specifies that the field to be displayed as a password. If the value parameter is present, the first character in the value indicates the password character to be used. By default, the * password character is used for non-TrueType fonts, else the black circle character is used. For instance, Mask on ";;;password=*", specifies that the field to be displayed as a password, and use the * for password character. If the value parameter is missing, the default password character is used.