C# forms in a form can you take an external input and a button using either show or showdialog to open or close with out freezing?

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C#

forms

I am new to C# I have been given the task of upgrading code from Visual Studio C++ 6.0 to Visual studio 2017. I have a form that takes an external input from a national instrument box as well as button to close the function. If I use a Modal form I have to use the close button I can not find a way to pass the external input in. If i use the Non-Modal form I can terminate with the external input but the form freezes and is unresponsive thus you can not click the button? How can i Solve this problem?

File Main_Menu.cs from a form app

public void OverloadTripearly()
        {
            
            OverloadTripEarly overloadTripEarly = new OverloadTripEarly();
            overloadTripEarly.Owner = this;
            overloadTripEarly.ShowDialog();             

        }

File NIDMMPXIeSlot5ConsoleApplication.cs

public static double SingleResistanceMeasurementApp()
      {
          // single example resistance value
          NIDmm sampleDmmSession = new NIDmm("PXI1Slot5", true, true);
          double range = 100;
          double resolution = 6.5;
          sampleDmmSession.ConfigureMeasurementDigits(DmmMeasurementFunction.TwoWireResistance, range, resolution);
          double reading = sampleDmmSession.Measurement.Read();
          double DMMValue = reading;
          sampleDmmSession.Close();
          return reading;
      }

OverloadTripEarly.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WinFormTitlepageNew
{
    public partial class OverloadTripEarly : Form
    {
        public OverloadTripEarly()
        {
            InitializeComponent();  
        }

        private void btnOK_Click(object sender, EventArgs e)
        {
            if (backgroundWorker1.IsBusy)
            {
                backgroundWorker1.CancelAsync();
            }
            else
            {
                this.Close(); // close if button is pressed
                this.Dispose();
            }
        }

        private void OverloadTripEarly_Load(object sender, EventArgs e)
        {
 
        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            do
            {
                
                    Thread.Sleep(100);

                    GlobalVariables.OverloadTest = NIDMMPXIeSlot5ConsoleApplication.SingleResistanceMeasurementApp();
                    if (double.IsNaN(GlobalVariables.OverloadTest))
                    {
                        GlobalVariables.OverloadFlag = true;
                        this.Close();
                        e.Cancel = true;

                    }
                    if (backgroundWorker1.CancellationPending)
                    {
                        e.Cancel = true;
                        this.Close();
                        return;
                    }
                
            } while (double.IsNaN(GlobalVariables.OverloadTest));
        }

        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {

        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Cancelled)
            { this.Close();
                this.Dispose();
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            GlobalVariables.OverloadTest = NIDMMPXIeSlot5ConsoleApplication.SingleResistanceMeasurementApp();
            if (double.IsNaN(GlobalVariables.OverloadTest))
            {
                textBox1.Text = "NaN".ToString();
            }
            else
            { textBox1.Text = GlobalVariables.OverloadTest.ToString(); }
        }
    }
}

What I have tried:

I have tried using Both Modal and Non-Modal forms show() and show dialog(). So far I can not have both input pieces with functional code. The show() freezes in the loop. The Showdialog() will not take the external input.

I added a background worker Class.

I will have to use a Modal showdialog form. I have added a button and textbox I can detect when the value changes after i click the button. How can i use the background worker to close this form when the value changes I thought i did that with the background worker but it not doing what i want it to
.