How to set focus on a textbox when I close another Form?

Question

I have two forms, Form1 and Form2. Form2 is opened from a button located in Form1. All I want is that when I close Form2 from X(cross) button in the upper right corner of the window, the focus is set to textbox1 of a Form1. Any help regarding this ??

Answer 1

Try this

  private void button1_Click(object sender, EventArgs e)
    {
        Form2 f = new Form2();
        f.Show();
        f.FormClosed += f_FormClosed;

    }

    void f_FormClosed(object sender, FormClosedEventArgs e)
    {
         textBox1.Focus();
    }

Answer 2

Write this code in form1 button click event:

form2 fm2 = new form2();
fm2.ShowDialog();     //to show as child form of Form1

textbox.Focus();    //as Form2 closes it will focus to your textbox now

Answer 3

You can assign an event handler to form2 's Close event manually like this:

form2 = new Form2();
form2.Closed += Form2Closed;
form2.Show();

public void Form2Closed(object sender, FormClosedEventArgs e)
{
    textBox2.Focus();
}

Please note that this works in your case, as you're not showing form2 with ShowDialog !

Also, this sets the focus if the form is closed by some other way, too, for example a button on the form. If you really only want to focus the text box if the close box of the window is clicked, you need to do a bit more.

public void Form2Closed(object sender, FormClosedEventArgs e)
{
    if (e.CloseReason == CloseReason.UserClosing)
    {
        Form2 f2 = sender as Form2;
        if (!f2.ClosedByUserElement)
            textBox2.Focus();
    }
}

Also, in Form2 you need a property ClosedByUserElement which is normally false , but set to true whenever the user closes the form by other means than the red X , for example a button:

private void button1_Click(object sender, EventArgs e)
{
    ClosedByUserElement = true;
    Close();
}

That way you can decide whether the user closed the window using the window's close box ( ClosedByUserElement would be false ) or by a manual call to Close , for example when a button is clicked ( ClosedByUserElement would be true ).

Answer 4

如果Form2是一个用ShowDialog()方法打开的模态表单，你可以简单地在Form1按钮Click事件中添加这个代码，在表单打开之后： this.textbox1.Focus();

Answer 5

Write this Code in Form1's Button Click Event by which button you open the Second Form

         Form2 frm2 = new Form2();
         frm2.ShowDialog(); // do what you want in your form, then close it

         yourTextbox.Focus();
         yourTextbox.BackColor = Color.LightYellow;  // instead of LightYellow Write whatever colour you want

Hope this Helps You ....

Answer 6

如果直接从一个父表单打开，则可以使用其他表单加载事件，如果要更改聚焦文本框，则可以使用父表单的用例。