Sales Commission Project

Question

I am working on a sales commission project and I am cannot figure out what to do next, any help would be greatly appreciated! Here is what I have so far.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Sales_Commission
    public partial class FrmSalesCommission : Form
        public FrmSalesCommission()
            InitializeComponent();
        // calculate commission for sales agents
        private void btnCalculate_Click(object sender, EventArgs e)
            // declare variables
            string lastname;
            string firstname;
            decimal commission;
            // assign variables
            lastname = txtLastName.Text;
            firstname = txtFirstName.Text;
            commission = lblCommissionTotal.
            // if first and last name are both empty 
            if (lastname == "" && firstname == "")
                // display the word commission
                lblCommission.Text = "Commission";
            else
                // display commission for + first name + last name
                lblCommission.Text = ("Gates"); 
            // if sales is numeric check if sales is negative
            // if sales is not negative
            // calculate commission
            // display calculated commission
            // else sales is negative message user
            // else sales is not numeric message user
Here is some more information.
Specifications:  You are to write an application that determines the commission earned for sales agents.  You must verify that the sales amount that was entered is indeed numeric.  If it is not, display a message box with an appropriate error
message, select the text, and allow the user to re-enter the data.  The Sales amount must be numeric and must be greater than or equal to 0. When a valid numeric sales amount has been entered, calculate and display the commission (10% commission). 
The application should also accept the sales agent’s first name and last name.  When the calculation for the commission is calculated, also display the label “Commission for first name last name” as entered in the textboxes.
If there is no name entered, display only the word ‘Commission’.
If either the first or the last name is entered… display the phrase ‘Commission for ****’ using either the first or last name.
When both the first and the last name are entered, display ‘Commission for Bill Gates’ where Bill is the first name and Gates is the last name.  ~ really any first name and last name should work!!
Consider logical tab sequence and data alignment.
The Clear button should clear all data (entered and calculated).  The Exit button should Exit the application.
Set appropriate accept button and cancel button.  Set appropriate access keys.
When a first name, last name or sales amount value is entered, clear all calculated display areas.
Use the standard Microsoft naming conventions for all controls.
Include appropriate comments in your code.

Answer 1

Hi
slipknotfan515,
As far as I know, about Sales Commission Project is a basic knowledge of OOP.  You should learn by yourself.
And there is a lot of material when you search in the internet like the following
https://www.google.com.hk/?gws_rd=ssl#q=Simple+Sales+Commission+Calculator+(using+OOP)
Good luck!
Kristin
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