[Solved] How can I get a Boolean from form 2 to form1?

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1- Create a new property In Form2 like this 

  public partial class Form2: Form
    {
        public static bool BolleanProperty { get; set; }
        // ...
    }

2- in the static constructor set property BolleanProperty = true

public partial class Form2: Form
{
    public static bool BolleanProperty { get; set; }
    static Form2()
    {
        BolleanProperty = true;

    }
    public Form2()
    {
        InitializeComponent();
    }
}

3- Now in Form1, you can access the property in Form2

 private void Form1_Load(object sender, EventArgs e)
        {
            label1.Text = Form2.BolleanProperty.ToString();
        }

Updated my answer for the new contributor Luuk Scherjon

To do this in your case, you can follow these steps

  1. Create tow public properties in Form3UpgradesGunSounds.

    public bool TankCannon100 { get; set; }
public bool TankCannon120 { get; set; }

  2. In Form3UpgradesGunSounds_MouseDoubleClick event

    replace _tankCannon100 & _tankCannon120 with the properties was created

    if (...) // FireTankCannon100
  TankCannon100 = true;
else if (...) // FireTankCannon120
  TankCannon120 = true;

  3. Now in Form1Game > MoleShooter_MouseClick you can access the properties created in Form3UpgradesGunSounds

    public void MoleShooter_MouseClick(object sender, MouseEventArgs e)
    {
        // ...  
        Form3UpgradesGunSounds fr3UpgradesSounds = new Form3UpgradesGunSounds();

        if (!fr3UpgradesSounds.TankCannon100)
        {
            // do something 
        }
        if (fr3UpgradesSounds.TankCannon120)
        {
            // do something 
        }

        // ... 
    }

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solved How can I get a Boolean from form 2 to form1?