Insert data into oracle from stored procedure called from button clickin asp.net code behind

create package in oracle
create procedure in that package

CREATE OR REPLACE PACKAGE BODY SCHEMA.TEST_PKG
AS
PROCEDURE TEST_PROC( P_EMP_ID IN VARCHAR2,P_FISRT_NAME IN VARCHAR2,P_LAST_NAME IN VARCHAR2,P_SALARY IN NUMBER, P_TRANSACTION_STATUS OUT VARCHAR2)
AS
BEGIN
INSERT INTO EMPLOYEE(EMP_ID,FISRT_NAME,LAST_NAME,SALARY)
VALUES (P_EMP_ID ,P_FISRT_NAME,P_LAST_NAME,P_SALARY);
P_TRANSACTION_STATUS := ‘SUCCESS’;

END;

In web code use microsoft enterprise libarry as ADO.net connectivity
and call above procedure from code behind

public string insert_data(string id, string name, string last_name, int salary)
    {
        string transactionstatus = string.Empty;
        if (db != null)
        {
            cmd = (OracleCommand)db.GetStoredProcCommand("TEST_PKG.TEST_PROC");
            cmd.Parameters.Add("P_EMP-ID", OracleType.VarChar, 2000).Value = id;
            cmd.Parameters.Add("P_FIRST_NAME",OracleType.VarChar, 2000).Value = name;
            cmd.Parameters.Add("P_LAST_NAME", OracleType.VarChar, 2000).Value = last_name;
            cmd.Parameters.Add("P_SALARY", OracleType.number, 2000).Value = salary;
            cmd.Parameters.Add("P_TRANSACTION_STATUS", OracleType.VarChar, 2000).Direction = ParameterDirection.Output;
            int i = db.ExecuteNonQuery(cmd);
            if (i <= 0)
            {
                transactionstatus = "FAIL";
            }
            return transactionstatus = cmd.Parameters["P_TRANSACTION_STATUS"].Value.ToString();
        }
        return transactionstatus;
    }