Question

trying to return data using OracleDataReader, getting

"Object reference not set to an instance of an object " at the line "odr = 
ocmd.ExecuteReader();",

Can anyone suggest what I am missing / done wrong?

thanks

T

           OracleConnection cn = null;
            OracleDataReader odr = null;
            OracleCommand ocmd = null;

            String con1 = System.Configuration.ConfigurationManager.ConnectionStrings["HousingDBConnectionString"].ConnectionString;
            cn = new OracleConnection(con1);
            cn.Open();

            string mysql = "SELECT stuff from tables";
            OracleCommand cmd = new OracleCommand(mysql, cn);
            odr = ocmd.ExecuteReader();
            Label2.Text = "connection success";

            ListBox1.Items.Clear();
            while (odr.Read()) 
            {
                ListBox1.Items.Add(odr["TCY_CORRESPOND_NAME"].ToString());
            }

Answer 1

You declared ocmd as null, but then you created another OracleCommand object as cmd. ocmd was never instantiated.

This part is wrong:

OracleCommand cmd = new OracleCommand(mysql, cn); 
odr = ocmd.ExecuteReader(); 

It should be:

OracleCommand cmd = new OracleCommand(mysql, cn); 
odr = cmd.ExecuteReader();