ODBC C# Excel

string connStr = "Dsn=Excel Files;dbq=" + file + ";";
OdbcConnection conn = new OdbcConnection(connStr);
conn.Open();
OdbcDataAdapter da = new OdbcDataAdapter("SELECT * FROM [工作表1$]", conn);
DataTable dt = new DataTable();
da.Fill(dt);
dataGridView1.DataSource = dt;