// access 2003

DBConStr = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" + AppPath + "sample.mdb";

// access 2007

DBConStr = "Provider=Microsoft.ACE.OLEDB.12.0; Data Source=" + AppDomain.CurrentDomain.BaseDirectory + "Sample.accdb";

Driver ={ Microsoft Access Driver(*.mdb, *.accdb)}; DBQ = path to mdb/ accdb file”

// mssql

DBConStr = "Provider = SQLOLEDB.1;Data Source = 192.168.3.251;Initial Catalog = Sample;User ID = sa; Password = 1";