How to copy last line and paste it in the same text box

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Hey Guys I have a button who is sending the text to the textbox

What I have tried:

private void button10_Click(object sender, EventArgs e)
        {

            string sent = button10.Text;
            textBox1.AppendText(sent);
            textBox1.AppendText(Environment.NewLine);
        }

now how I can if I have to click button 5 times can do it with a button click I was thinking just to click a button who will copy the last line in the textbox and paste it in the same text box *times how much I wright it I can not simulate a button click because i have more that one button

Posted 30-Mar-21 21:01pm

Kleo Rogers

Updated 30-Mar-21 21:30pm

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Arfat M 31-Mar-21 3:16am

description of issue isn't so clear can you brief what exactly you are in need

Kleo Rogers 31-Mar-21 3:24am

I need to copy the last line of the textbox1 and paste it in the same textbox that many times how much i wright it in textbox2

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Maciej Los · Accepted Answer · 2021-03-30T21:30:00

Well, you need only one event for all your textboxes:

C#

private void button_Click(object sender, EventArgs e)
{
    //get clicked button
    Button btn = sender as Button;
    //check how many times this button has been clicked
    int cnt = btn.Tag == null ? 0 : (int)btn.Tag;
    //save value+1 for further use
    btn.Tag = cnt +1;
    //get last line from textbox
    string sent = textBox1.Lines[textBox1.Lines.Count-1];
    textBox1.AppendText(string.Format("\n{0} has been clicked {1} times", btn.Name, cnt));
}