Issue in zipping a file

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C#

Hello..
I'm working with zipping and unzipping a file. I'm able to zip a file. But when i unzip, it should extract only destination file rather than complete directory... In the sense while adding files to zip file something should be done.
Code which i wrote is ...

ZipFile z = ZipFile.Create("C:/Documents and Settings/user1/Desktop/temp/OutBox/" + datamethod.CompanyName() + textfilename + ".TPT");
z.BeginUpdate();
z.Add("C:/Documents and Settings/user1/Desktop/mysql.txt");
z.CommitUpdate();
z.Close();