如何使用ODBC搭配dsn链接数据库

     {
       OdbcConnection cn;
       OdbcCommand cmd;
       string MyString;

       MyString="Select * from Customers";

       cn= new OdbcConnection("dsn=myDSN;UID=myUid;PWD=myPwd;");

       cmd=new OdbcCommand(MyString,cn);

       cn.Open();
       MessageBox.Show("Connected");

       cn.Close();
     }