如何将文本从一个文本框添加到另一个文本框？

Question

Basically I'm making a simple program to help take notes at my job. I have a one line textbox1 , and a multiple line textbox2 .

I want to be able to type whatever in textbox1 , and then press "enter" and it show up in the first line in textbox2 . Any help would be appreciated.

    public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

    }

    private void textbox1_TextChanged(object sender, EventArgs e)
    {

    }

    private void textBox2_TextChanged(object sender, EventArgs e)
    {

    }
}

Answer 1

//in form constructor, or InitializeComponent method
textBox1.Validated += DoValidateTextBox;



//in another place of your class
private void DoValidateTextBox(object sender, EvenArgs e) {
  textBox2.Text =  ((TextBox)sender).Text + Environment.NewLine + textBox2.Text;
}

Answer 2

This should work:

private void textBox1_KeyDown(object sender, KeyEventArgs e) // Keydown event in Textbox1
{
  if (e.KeyCode == Keys.Enter) // Add text to TextBox2 on press Enter
  {
    textBox2.Text += textBox1.Text;
    textBox2.Text+= "\r\n"; // Add newline
    textBox1.Text = string.Empty; // Empty Textbox1
    textBox1.Focus(); // Set focus on Textbox1
  }
}

If you want to add text at the firstline of your textbox, then replace in the code above:

textBox2.Text = textBox1.Text + "\r\n" + textBox2.Text;

Answer 3

It depends on what you want the final result to be. If all you want is the first line of the second textbox to equal the first then:

void myEvent()
{
    textbox2.Text = textbox1.Text;
}

If however you want whatever is in textbox1 to be appended to textbox2 every time you press a button, then you are better off using a ListView:

void myEvent()
{
   myListView.Items.add(textbox1.Text);
}

If you specifically want a textbox though (with the data always appended to the first line):

void myEvent() 
{ 
   textbox2.Text = textbox1.Text + Environment.NewLine + textbox2.Text; 
}