How do I do an equation in a private class, and pass it to be added to a customer form

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C#

Hello,

Right now I can do the equation I want just find and have it show on my "Add New Patient" form. But I know the way I am doing it will not have the value passed to the actual "Patient Records form that I am building.

First, I will show my class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PatientRecords
{
    public  class Intake
    {
        private string name;
        private int patientId;
        private int weight;
        

        //Constuctor
        public Intake() { }

        //Overload Constructor
        public Intake(string name, int patientId, int weight)
        {
            this.Name = name;
            this.PatientId = patientId;
            this.Weight = weight;
            

        }
        public double GetProteinIntake()
        {
          
            return weight * .86;
        }

        public string Name
        {
            get
            {
                return name;
            }
            set
            {
                name = value;
            }
        }
        public int PatientId
        {
            get
            {
                return patientId;
            }
            set
            {
                patientId = value;
            }
        }
        public int Weight
        {
            get
            {
                return weight;
            }
            set
            {
                weight = value;
            }
        }
      

       public override string ToString()
       {
           return string.Format("Name: {0}, PatientId: {1}, Weight: {2}", Name, PatientId, Weight);
       }
    }
}

Edit: I will be honest and say I am even more lost now. I have been learning from a book "Murach C# 2015" and the only experience I had was using a lambda operator and expression body. I think I understand what you're saying in the sense of doing everything in one class, but this is competely new, in how I am doing it. This is just the code you posted

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 PatientForm
{

public partial class Patient : Form
{

// commented out, don't understand this except how I used it in my intake form, which the other user taught me this in a condensed way. public Patient { get; private set; }
public Patient()
{
InitializeComponent();
}


private void btnSave_Click(object sender, EventArgs e)
{
{
int patId;
if (!int.TryParse(txtPatientId.Text, out patId))
{
MessageBox.Show("Please enter a valid Patient ID");
return;
}
int patWeight;
if (!int.TryParse(txtWeight.Text, out patWeight))
{
MessageBox.Show("Please enter a valid Patient Weight");
return;
}
Patient = new Patient(txtName.Text, patId, patWeight);
}
}
private void btnExit_Click(object sender, EventArgs e)
{
this.Close();
}
}
}

What I have tried:

And here is my add patient form.

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 PatientRecords
{
    public partial class Add_Patient_Info : Form
    {
        public static Intake intake = null;
        public Intake GetNewPatient ()
        {
            this.ShowDialog();
            return intake;
        }

        public Add_Patient_Info()
        {
            InitializeComponent();
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void btnCalculate_Click(object sender, EventArgs e)
        {
            try
            {
                Intake intake = new Intake(txtName.Text, Convert.ToInt32(txtPatientId.Text), Convert.ToInt32(txtWeight.Text));
                txtProtein.Text = intake.GetProteinIntake().ToString();
            }
            catch (FormatException)
            {

            }
            catch (OverflowException)
            {

            }
        }
    }