如何在类和GUI C＃之间建立链接

Question

我已经创建了一个类并且已经编写了类的单选按钮，并希望将它链接到GUI按钮上的代码是否可能？使用的GUI是Windows表单应用程序

班级代码

public void OnlineSalesman(double OnlinePercentage,  double OnlineSales)
    {
        double Commission = OnlinePercentage * OnlineSales;
        double Total = Commission + OnlineSales;
        Message = Commission.ToString();
        Message1 = Total.ToString();
    }

    public void PhoneSalesman(double PhonePercentage, double PhoneSales)
    {
        double Comission = PhonePercentage * PhoneSales;
        double Total = Comission + PhoneSales;
        Message = Comission.ToString();
        Message1 = Total.ToString();
    }

    public void DoorSalesman(double DoorPercentage, double DoorSales)
    {
        double Comission = DoorPercentage * DoorSales;
        double Total = Comission + DoorSales;
        Message = Comission.ToString();
        Message1 = Total.ToString();
    }

我希望将类单选按钮代码添加到

中的GUI按钮的代码

private void btnSave_Click(object sender, EventArgs e)
    {
        double sales = 0;

        if (txtID.Text == "")
        {
            MessageBox.Show("Please enter ID");
            txtID.Focus();
        }
        else if (txtSales.Text == "")
        {
            MessageBox.Show("Please enter Sales");
            txtSales.Focus();
        }
        else if (txtName.Text == "")
        {
            MessageBox.Show("Please Enter Name ");
        }

        else if (double.TryParse(txtSales.Text, out sales) == false)
        {
            MessageBox.Show("Numeric Value only");
            txtSales.Focus();
        }

        else
        {
           if (the codes i want to link from the class)
        }
    }