Connectin problem to MSDE

ConnectionString = "Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;Initial Catalog=MyDB;Data Source=MYSYSTEM\VSdotNET"

instead of DATA SOURCE =MYSYSTEM\VSdotNET
I need to connect to the local machines Datasource when ever the exe is excuted on other machine. I altered and tried with

Data Source = Local
Data Source = Default
Data Souce = LocalHost

all the three attempts where in vain , Please do rectify me such that I can connect to the systems ( other machine ) local database when ever I execute the exe from other machine.