SQL Backup error in c sharp

Question

dbMDFName = C:\main\ext\AssetTrackingExt.mdf;
dbLDFName = C:\main\ext\AssetTrackingExt.ldf;
string str = "use master 
 GO 
 sp_attach_db 'ATT'" + "," + "'" + dbMDFName + "'" + "," + "'" + dbLDFName + "'";
this is my backup database code but an error occur
"Incorrect sysnat near Go"
what is solution for this error

jayakrishnan Morayur · Answer

yes i am from kerala

Suthish Nair · Answer

Jayakrishnan, you are from Kerala?

Jaganathan Bantheswaran · Answer

Hi,
Try like this,
string str = "use master 
 GO 
 sp_attach_db N'ATT'" + "," + " N' " + dbMDFName + "'" + "," + " N' " + dbLDFName + "'";