C# / ORACLE/ODP query Select * from v$version

Hi,
after a succesful connection to the database I want to run the query "Select * from v$version where banner like '%Oracle'"

how can I display the result in a multiline Textbox? (This is the part I am having the issue, it displays nothing)

This the code I have:

                conn.Open();

                string strSQL = "select * from v$version WHERE banner LIKE '%Oracle'";
                OracleCommand cmd = new OracleCommand(strSQL, conn);
                OracleDataReader reader = cmd.ExecuteReader();

                while (reader.Read())
                {
                    reader.GetString(0);
                    txtQuery.Text = reader;
                }

                conn.Close();
                conn.Dispose();
                conn = null;
                
            }

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