如何将文本框的文本从弹出窗口传递到主窗体？

Question

My program is basically reading barcodes, but I want to allow users to enter barcode manually, so I created a pop up window for that. After entering the barcode, I want the pop up window to disappear and send data to the main form when ENTER is hit, but I have no clue how this data can be passed to the main form.

Answer 1

Ok, this is pretty straightforward, I'll show you with an example. You have two forms: Form1 mainForm and Form 2 subForm.

mainForm calls subForm as follows:

using (Form2 subForm = new Form2())
{
    if (subForm.ShowDialog() == DialogResult.OK)
    {
        string my_text = subForm.TextToReturn;
        // Do stuff with my_text
    }
}    

In SubForm you will have something like this declared in the class scope:

public string TextToReturn;

private void button1_Click(object sender, EventArgs e)
{
    TextToReturn = text_box.Text; 
    this.DialogResult = DialogResult.OK;
}