Conn = @"Provider=VFPOLEDB.1;Data Source=D:\Work;Password=;Mode=ReadWrite;Collating Sequence=MACHINE;Extended Properties=dBASE III";
...
string strCmd1 = @"create table D:\Work\nfpo.dbf (RM char(1), KVK numeric(3,0), " +
                "KOBL numeric(2,0), KRAJ numeric(2,0), KSEL numeric(2,0), KPOL numeric (5,0), " +
                "UDK numeric(2,0), VDK numeric(2,0), SRK numeric(1,0), KRK numeric (5,0), " +
                "NPO char(38), KOKPO char(14), NPOP char(150), DOK numeric(8,0), KS char(4)," +
                "IPS numeric(1,0));";
OleDbConnection cn = new OleDbConnection(Conn);
cn.Open();
OleDbCommand cmd = new OleDbCommand(strCmd1, cn);
cmd.ExecuteNonQuery();

string strCmd2 = @"insert into D:\Work\nfpo.dbf(NPO) select KNAZ from D:\Work\rrk.dbf);";
OleDbCommand cmd2 = new OleDbCommand(strCmd2, cn);
cmd2.ExecuteNonQuery(); //тут выдает ошибку

string strCmd2 = @"select RM from D:\Work\rrk.dbf);";
OleDbDataAdapter adapter = new OleDbDataAdapter(strCmd2, Conn);
DataSet ds = new DataSet();
adapter.Fill(ds);
dataGridView1.DataSource = ds.Tables[0];