I want to implement the wind GotFocus in a TextBox , so that when it gets focus, it sets the Text property to string.empty .
However, I have 6 TextBox that will execute this event. How do I identify which TextBox ? And how do I set the Text property to string.empty ?
Using the sender that is received per parameter in the event.
private void txtBox_GotFocus(object sender, EventArgs e)
{
var txt = (TextBox)sender;
txt.Text = "";
}
In this answer a good explanation about sender was given.
For your case, completing the jbueno response, I've implemented a way to assign all textboxes to the GotFocus event.
Also, a way to assign only to a certain group of controls.
The region I created can be converted to a method if you want.
public Form1() {
InitializeComponent();
#region Atribui a TODOS os textbox o evento GetFocus
//cria uma lista com todos os controles do formulário do tipo TextBox
var listTextBox = this.Controls?.OfType<TextBox>();
//Se por exemplo, você tiver um conjunto de textbox onde, só a eles deseja esse evento,
//então poderá filtrar pelo nome deles - ou qualquer outra propriedade
var listTextBox = this.Controls?.OfType<TextBox>().Where(p => p.Name.Contains("TextBoxOpcoes"));
foreach (var item in listTextBox) {
item.Enter += new EventHandler(TextBoxOpcoes_GotFocus);
}
#endregion
}
//Método que irá limpar a propriedade Text do controle
private void TextBoxOpcoes_GotFocus(object sender, EventArgs e) {
((TextBox)sender).Text = String.Empty;
}