string filePath = textBox1.Text;    //文件路径，如：E:\a.dbf
            FileInfo fi = new FileInfo(filePath);
            string mulu = fi.DirectoryName;
            string filename = fi.Name;

            OleDbConnection conn = new OleDbConnection();
            string table = filePath;
            string connStr = @"Provider=VFPOLEDB.1;Data Source=" + mulu + ";Collating Sequence=MACHINE";

            conn.ConnectionString = connStr;
            conn.Open();
            string sql = @"select * from " + filename;

            OleDbDataAdapter da = new OleDbDataAdapter(sql, conn);
            DataTable dt = new DataTable();
            da.Fill(dt);
            dataGridView1.DataSource = dt;