How do I compare a system.environment.specialfolder to a string.

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C#

string

System.Environment

, +

The issue I am having is I get an error "Cannot implicitly convert type System.Environment.SpecialFolder to String". Everything is working great except for btn4 where the error is. Line 61 is the issue "

if (windir = folderselect.RootFolder)

" Below is my code.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using static System.Windows.Forms.VisualStyles.VisualStyleElement.Window;
using System.IO;
using static System.Windows.Forms.VisualStyles.VisualStyleElement;
using System.Windows.Shell;

namespace Client_Backup
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : System.Windows.Window
    {
        private string windir;
        public MainWindow()
        {
            InitializeComponent();
            windir = System.IO.Path.GetPathRoot(Environment.SystemDirectory);
            //tb2.Text = windir;
        }

        private void btn2_Click(object sender, RoutedEventArgs e)
        {
            for (int i = LB1.SelectedItems.Count - 1; i >= 0; i--)
            {
                LB1.Items.Remove(LB1.SelectedItems[i]);
            }
        }

        private void btn1_Click(object sender, RoutedEventArgs e)
        {
            if (new FolderBrowserDialog().ShowDialog() == System.Windows.Forms.DialogResult.OK)
                LB1.Items.Add(new FolderBrowserDialog().SelectedPath);
        }

        private void btn3_Click(object sender, RoutedEventArgs e)
        {

        }

        private void btn4_Click(object sender, RoutedEventArgs e)
        {
            //tb2.Text = windir;
            FolderBrowserDialog folderselect = new FolderBrowserDialog();
            if (folderselect.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                if (windir = folderselect.RootFolder)
                {
                    tb2.Text = "you have selected the system drive for a backup destination. please select a different drive.";
                }
                tb1.Text = (folderselect.SelectedPath);
            }
        }


        private void tb1_TextChanged(object sender, TextChangedEventArgs e)
        {
            tb1.Background = Brushes.FloralWhite;
        }

        private void btn5_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }

        private void btn6_Click(object sender, RoutedEventArgs e)
        {
            if (this.WindowState == WindowState.Maximized)

                this.WindowState = WindowState.Normal;
            else
                this.WindowState = WindowState.Maximized;
        }

        private void btn7_Click(object sender, RoutedEventArgs e)
        {
            this.WindowState = WindowState.Minimized;
        }

        private void rectangle1_MouseDown(object sender, MouseButtonEventArgs e)
        {
            DragMove();
        }

        private void Cbx2Changed(object sender, RoutedEventArgs e)
        {
            if (cbx2.IsChecked == true)
            {
                LB1.IsEnabled = false;
                btn1.IsEnabled = false;
                btn2.IsEnabled = false;
            }
            else
            {
                LB1.IsEnabled = true;
                btn1.IsEnabled = true;
                btn2.IsEnabled = true;
            }
        }

        private void Cbx1Changed(object sender, RoutedEventArgs e)
        {

        }

    }
}

What I have tried:

There is no typo here. I have tried == as well as =. Using == introduces an additional error of "Operator == cannot be applied to operands of type string and Environment.SpecialFolder."
It appears to be a comparison issue that I can't get around. Everything else works fine...