How to force textbox to be focused

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I have a text box that I want to set its focus
from inside mouse enter event.

But I failed to do that.

Please any help.

Thank you.

What I have tried:

private void InputTB_MouseEnter(object sender, EventArgs e)
{
  if (isRunning) return;
  if(languageCKB.Checked)
  {
    Application.CurrentInputLanguage = InputLanguage.FromCulture(new CultureInfo(en_us));
    InputTB.RightToLeft = System.Windows.Forms.RightToLeft.No;
  }
  else
  {
    Application.CurrentInputLanguage = InputLanguage.FromCulture(new CultureInfo(he_IL));
    InputTB.RightToLeft = System.Windows.Forms.RightToLeft.Yes;
  }
    ActiveControl = InputTB;
    InputTB.TabIndex = 0;
    InputTB.Focus();
    InputTB.Select();
}

Posted 1-Apr-21 4:57am

Member 13569650

Updated 1-Apr-21 5:15am

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OriginalGriff · Accepted Answer · 2021-04-01T05:15:00

You are using Windows forms, so I just tried it: two text boxes, both handled by the same event handler:

C#

private void MyTextBoxes_MouseEnter(object sender, EventArgs e)
    {
    if (sender is TextBox tb)
        {
        tb.Focus();
        }
    }

And sure enough, it works: as the mouse moves between them, so does the input focus.

I'd suggest you use the debugger to see if isRunning is set when you don't think it should be.