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using Oracle.DataAccess.Client;
using Oracle.DataAccess.Types;
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OracleConnection
OracleCommand
        OracleParameter
OracleDataReader
OracleDataAdapter
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            string oradb = "Data Source=TESTASM;User Id=hr;Password=hr;";
            OracleConnection conn = new OracleConnection(oradb);
            conn.Open();
            OracleParameter param = new OracleParameter();
            param.OracleDbType = OracleDbType.Decimal;
            param.Value = textBox1.Text;
            OracleCommand cmd = new OracleCommand();
            cmd.Connection = conn;
            
            cmd.Parameters.Add(param);
            cmd.CommandText = "select department_name from departments where department_id = :1";
           
            if(dr.Read())
            {
                  textBox1.Text = dr.GetString(


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