How do I display numbers in a text box when I click a button?

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C#

Windows

forms

Im new to c# and im building a windows form for the Modified early warning scoring system (MEWS) which is used in hospitals to monitor a patients health. I have built a GUI for it, but im not sure what code to put in to get it to work. Im using timers to move coloured labels across the screen to represent a patient vital signs.

Ive but a button in which starts the timers and this works fine. But what I want to do next is show a score based on the output of that vital sign timer. I want to use buttons which when pressed will display the score in a text box. What I want to know is what code do i use to make this work? Also can you give me example code since I will most likely not know how to write it out myself.

Heres the code for my program so far:

namespace MewsV1._0
{
    public partial class frmMews : Form
    {

        Random r = new Random();

        public frmMews()
        {
            InitializeComponent();
        }

        private void txtPatientName_TextChanged(object sender, EventArgs e)
        {

        }

        private void frmMews_Load(object sender, EventArgs e)
        {
            tmrResps.Enabled = false;
            tmrResps.Interval = 300;  // milliseconds

            tmrHeart.Enabled = false;
            tmrHeart.Interval = 700;  // milliseconds

            tmrBlood.Enabled = false;
            tmrBlood.Interval = 700;  // milliseconds

            tmrConsious.Enabled = false;
            tmrConsious.Interval = 600;  // milliseconds

            tmrTemp.Enabled = false;
            tmrTemp.Interval = 600;  // milliseconds

            tmrUrine.Enabled = false;
            tmrUrine.Interval = 600;  // milliseconds

        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            tmrResps.Enabled = true;
            tmrResps.Interval = 2000;  // milliseconds

            tmrHeart.Enabled = true;
            tmrHeart.Interval = 1000;  // milliseconds

            tmrBlood.Enabled = true;
            tmrBlood.Interval = 2000;  // milliseconds

            tmrConsious.Enabled = true;
            tmrConsious.Interval = 5000;  // milliseconds

            tmrTemp.Enabled = true;
            tmrTemp.Interval = 1000;  // milliseconds

            tmrUrine.Enabled = true;
            tmrUrine.Interval = 5000;  // milliseconds
        }

        private void tmrResps_Tick(object sender, EventArgs e)
        {
            Random r = new Random();

            int x = ( (int)( (r.Next(0, 100) ) / 10) ) * 10;

            //---

            if (lblResps.BackColor == System.Drawing.Color.Magenta)
            {
                lblResps.BackColor = System.Drawing.Color.Magenta;
                lblResps.Size = new System.Drawing.Size( x, 23);
            }
            else
            {
                lblResps.BackColor = System.Drawing.Color.Magenta;
            }

        }

        private void tmrHeart_Tick(object sender, EventArgs e)
        {
            int x = ((int)((r.Next(0, 100)) / 10)) * 10;

            if (lblHeart.BackColor == System.Drawing.Color.Cyan)
            {
                lblHeart.BackColor = System.Drawing.Color.Cyan;
                lblHeart.Size = new System.Drawing.Size(x, 23);
            }
            else
            {
                lblHeart.BackColor = System.Drawing.Color.Cyan;
            }
        }

        private void tmrBlood_Tick(object sender, EventArgs e)
        {
            int x = ((int)((r.Next(0, 100)) / 10)) * 10;


            if (lblBlood.BackColor == System.Drawing.Color.Red)
            {
                lblBlood.BackColor = System.Drawing.Color.Red;
                lblBlood.Size = new System.Drawing.Size(x, 23);
            }
            else
            {
                lblBlood.BackColor = System.Drawing.Color.Red;
            }

        }

        private void tmrConsious_Tick(object sender, EventArgs e)
        {
            int x = ((int)((r.Next(0, 100)) / 10)) * 10;

            if (lblConsious.BackColor == System.Drawing.Color.Green)
            {
                lblConsious.BackColor = System.Drawing.Color.Green;
                lblConsious.Size = new System.Drawing.Size(x, 23);
            }
            else
            {
                lblConsious.BackColor = System.Drawing.Color.Green;
            }

        }

        private void tmrTemp_Tick(object sender, EventArgs e)
        {
            int x = ((int)((r.Next(0, 100)) / 10)) * 10;

            if (lblTemp.BackColor == System.Drawing.Color.Brown)
            {
                lblTemp.BackColor = System.Drawing.Color.Brown;
                lblTemp.Size = new System.Drawing.Size(x, 23);
            }
            else
            {
                lblTemp.BackColor = System.Drawing.Color.Brown;
            }
        }

        private void tmrUrine_Tick(object sender, EventArgs e)
        {
            int x = ((int)((r.Next(0, 100)) / 10)) * 10;

            if (lblUrine.BackColor == System.Drawing.Color.Yellow)
            {
                lblUrine.BackColor = System.Drawing.Color.Yellow;
                lblUrine.Size = new System.Drawing.Size(x, 23);

            }
            else
            {
                lblUrine.BackColor = System.Drawing.Color.Yellow;
            }
      }
    }
}
}

Random Number code im using:

namespace RandomNumber
{
    class Program
    {
        static void Main(string[] args)
        {
            Random r = new Random();

            for (int i = 0; i < 500; i++)
            {
                int x = ( (int)( ( r.Next(0, 100) ) / 10 ) ) * 10;

                Console.WriteLine(x.ToString());
            }
        }
    }
}