Making TextBox Clear when user starts typing

Question

I have two text boxes in a win forms that the user will be typing information into. I would like to clear the text box when the user start typing. I am using the TextChanged event handler, so every time I type it will erase, which makes me not able to type anything into the text box. Here is the code I am using:

private void TXTBX_HourlyRatae_TextChanged(object sender, EventArgs e)
    {
      TXTBX.HourlyRate.Clear();
      TXTBX.HoursWorked.Clear();
    }

I understand that everytime I type into the text box I will be executing this event handler, but I don't know how to go about making it execute only the first time I type into the text box.

Answer 1

private bool firsttime = true;

private void TXTBX_HourlyRatae_TextChanged(object sender, EventArgs e)
{
      if (firsttime)
      {
          TXTBX.HourlyRate.Clear();
          TXTBX.HoursWorked.Clear();
          firsttime = false;
      }
}

if you want to do it everytime you enter the textbox handle the loss focus event

private void TXTBX_HourlyRatae_LostFocus(object sender, System.EventArgs e)
    {

    }       firsttime = true;

Answer 2

将您的Clear()调用移到相应的Enter或GotFocus事件中。

Answer 3

Create a new private class member:

private bool _userHasEnteredText = false;

Only erase the text when this bool is false, then set this bool to true once you've cleared the text the first time.