asp.net c# oledbconnection InvalidOperationException -

error: unrecognised escape sequence.

code:

    string connectionstring = "provider=microsoft.ace.oledb.12.0;data source=|datadirectory|\drivebuy.accdb";     oledbconnection con = new oledbconnection(connectionstring);       if (fileupload1.hasfile)      {         string spath = mappath(fileupload1.filename);         fileupload1.postedfile.saveas(spath);           con.open();         string mysql;          mysql = "insert cars(make,model,price,picture) values (?,?,?,?)";         oledbcommand cmd = new oledbcommand(mysql, con);         cmd.parameters.addwithvalue("@p1", tbmake.text);         cmd.parameters.addwithvalue("@p2", tbmodel.text);         cmd.parameters.addwithvalue("@p3", convert.todecimal(tbprice.text));         cmd.parameters.addwithvalue("@p4", fileupload1.filename);         cmd.executenonquery();         con.close();     }     else     {         lblerror.text = "image not uploaded";     } 

any ideas? i'm trying input data access database. error appears on connection string, "\"

cheers

you're passing empty connection string

 string connectionstring = ""; 

in order connect database need specify valid connection string. this site might helpful.

edit

data directory supposed directory of access db

// fix data source correct directory string connectionstring = "provider=microsoft.ace.oledb.12.0;data source=c:\\drivebuy.accdb"; 

edit2

sorry parameters in fact correct pointed in comments d stanley, thanks.