Simple string question

Question

Hello,
I just want to insert today's date into backup files name. Codes are below;
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string today = DateTime.Today.ToShortDateString().ToString();
            string parametre1 = "/C mysqldump -u root -pcsi csfdb  force_db_ci > backup_'"+today+"'_1.sql"; // now closing cmd window
            Process islem = new Process();
            islem.StartInfo.FileName = "C:\\Windows\\System32\\cmd.exe";
            ...
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How can I insert today's string into backup file's name?