copy vb.net project from 1 to other computer-error

[dreamslanka]

vb.net walin hadapu sql data base ekak use karana project ekak eka computer ekakin wena ekakata copy karala,database files sql walin hariyata attach karala run karama error ekak enawa.

login form eke con.open() kiyana line eka yellow colour eken highlight wela eta passe visual studio aplication eka close wenawa.mekata reason eka mokakada?
data base eka hariyata connect wela thiyenne.

please help me