Install SQL Server 2012 from the Command Prompt Not working.

Hi all. I develop a software in c# and Sql Express 2012,Now I want to publish the application and I need to install sql express 2012 before application installation.I want to use a silent installation for sql express 2012,I searched for it and found some solution that used cmd. I am using following commandline:- E:\>SQL2012e.exe /QS /ACTION=install /INSTANCENAME="PC-1\MVSQL" /SAPWD=hello12 34 /SQLSVCSTARTUPTYPE=Automatic /SQLSYSADMINACCOUNTS=Administrator /SQLSVCSTARTU PTYPE=Automatic /TCPENABLED=1  /IACCEPTSQLSERVERLICENSETERMS=1 Installation working properly but i have one problem. INSTANCENAME not changing its remain SQLEXPRESS. Can anyone help what is the problem. Thanks in advance. ...