WinForms event for TextBox focus?

Question

I want to add an even to the TextBox for when it has focus. I know I could do this with a simple textbox1.Focus and check the bool value... but I don\'

Answer 1

You're looking for the GotFocus event. There is also a LostFocus event.

textBox1.GotFocus += textBox1_GotFocus;

Answer 2

Here is how you wrap it and declare the handling function, based on Hans' answer.

namespace MyNameSpace
{
 public partial class Form1 : Form
 {
  public Form1()
  {
   InitializeComponent();
  }

  private void Form1_Load(object sender, EventArgs e)
  {
   txtSchedNum.Enter += new EventHandler(txtSchedNum_Enter);
  }
  protected void txtSchedNum_Enter(Object sender, EventArgs e)
  {
   txtSchedNum.Text = "";
  }
 }
}

Answer 3

this.tGID.GotFocus += OnFocus;
this.tGID.LostFocus += OnDefocus;

private void OnFocus(object sender, EventArgs e)
{
   MessageBox.Show("Got focus.");
}

private void OnDefocus(object sender, EventArgs e)
{
    MessageBox.Show("Lost focus.");
}

This should do what you want and this article describes the different events that are called and in which order. You might see a better event.

Answer 4

I up-voted Hans Passant's comment, but it really should be an answer. I'm working on a Telerik UI in a 3.5 .NET environment, and there is no GotFocus Event on a RadTextBoxControl. I had to use the Enter event.

textBox1.Enter += textBox1_Enter;