Question

I need help passing input in Form2.textbox1 to Form1.sti
Form1 = Main working window
Form2 = Popup window, to enter path.

public partial class Form2 : Form
{
    public Form2()
    {
        InitializeComponent();
    }

    private void Form2_Load(object sender, EventArgs e)
    {

    }

    public string sti { get; set; }

    private void button1_Click(object sender, EventArgs e)
    {
        textBox1.Text = sti;
        this.Close();
    }
}

public partial class Form1 : Form
{
    int CountR = 1;

    public Form1()
    {
        InitializeComponent();
    }

    public string sti { get; set; }

    public void Form1_Load(object sender, EventArgs e)
    {
        Form2 popup = new Form2();
        popup.ShowDialog();
        popup.Dispose();
    }
   public void button1_Click(object sender, EventArgs e)
    {                
    Label7.Text = sti; 
     }

But it always returns Null.

I’ve builded it this way because I don’t want user to mess with the path only IT administrators.

Thank you in advance

Answer 1

You are creating a new Form1 that does not have a reference to the Form2 that you created.

You changed your example, you have created 2 different sti properties, you need to assign the Form2 sti value to the property in Form1 before you close Form2.

This code should work for you.

Form1

public partial class Form1 : Form
{
    public string sti { get; set; } 

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        Form2 popup = new Form2();
        popup.ShowDialog();
        sti  = popup.sti;
        popup.Close();
        popup.Dispose(); 

    }

    private void button1_Click(object sender, EventArgs e)
    {
        label1.Text = sti;
    }

}

Form2

public partial class Form2 : Form
{
    public string sti { get; set; } 

    public Form2()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {

        sti = textBox1.Text;
        this.Hide();
    }
}

---

You can also create a static class that can be referenced from both forms, that way you are dealing with only one sti property. Something like this:

Form1

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        myProperties.sti = "Hello";
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        Form2 popup = new Form2();
        popup.ShowDialog();
        popup.Dispose(); 

    }

    private void button1_Click(object sender, EventArgs e)
    {
        label1.Text = myProperties.sti;
    }
}

public static class myProperties
{
    public static string sti { get; set; } 
}

Form2

public partial class Form2 : Form
{
    public Form2()
    {
        InitializeComponent();
        textBox1.Text = myProperties.sti;
    }

    private void button1_Click(object sender, EventArgs e)
    {

        myProperties.sti  = textBox1.Text;
        this.Close();
    }
}