1, the load database
Using Oracle. ManagedDataAccess. Client;

 
Private void Form1_Load (object sender, EventArgs e) 
{
The DataTable mytab=new DataTable (); 
String SQL="select mids, mtitle from mail_model order by mid"; 
OracleConnection myconn=new OracleConnection (MyconnString); 
OracleDataAdapter myda=new OracleDataAdapter (SQL, myconn); 
Myda. The Fill (mytab); 
GridControl1. The DataSource=mytab; 
} 

Line 2, double click on the select event:

 
Private void gridControl1_MouseDoubleClick (object sender, MouseEventArgs e) 
{
TextBox1. Text=gridView1. GetFocusedRowCellValue (" mid "). The ToString ();===== error: the object reference not set to an instance of an object  
TextBox2. Text=gridView1. GetFocusedRowCellValue (" mtitle "). The ToString (); 
} 

3, declare: the same way, using a SQL database won't be an error, using the oracle database error,
4, I have done in the same form in the experiment, two table reference SQL and oracle database experiments respectively, SQL, oracle,