String Property Type 

Active Directory uses several different syntax types to represent strings. System.DirectoryServices uses the String class to represent all of the following syntax types:

• Object(DS-DN)

• For more information, see the topic Object(DS-DN) in the MSDN Library at http://msdn.microsoft.com/library.

• Object(Presentation-Address)

• For more information, see the topic Object(Presentation-Address) in the MSDN Library at http://msdn.microsoft.com/library.adschema.s_object_ds_dn

• String(IA5)

• For more information, see the topic String(IA5) in the MSDN Library at http://msdn.microsoft.com/library.adschema.s_string_ia5

• String(Numeric)

• For more information, see the topic String(Numeric) in the MSDN Library at http://msdn.microsoft.com/library.adschema.s_string_numeric

• String(Object-Identifier)

• For more information, see the topic String(Object-Identifier) in the MSDN Library at http://msdn.microsoft.com/library.adschema.s_string_object_identifier

• String(Printable)

• For more information, see the topic String(Printable) in the MSDN Library at http://msdn.microsoft.com/library.adschema.s_string_printable

• String(Teletex)

• For more information, see the topic String(Teletex) in the MSDN Library at http://msdn.microsoft.com/library.adschema.s_string_teletex

• String(Unicode)

• For more information, see the topic String(Unicode) in the MSDN Library at http://msdn.microsoft.com/library.adschema.s_string_unicode

String address= ent.Properties["streetAddress "].Value.ToString();
Console.WriteLine(address);