Question

There are a button and a textbox. I added a “KeyDown” event to textbox so that when “enter” is pressed button gets clicked. Good, then I tried to give focus to textbox again but failed. In the code below I tried three ways but neither is working.

private void txt_addRemove_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Return)
    {               
        btn_BC_add.RaiseEvent(new RoutedEventArgs(Button.ClickEvent));

        // 1.way
        // IInputElement focusedElement = FocusManager.GetFocusedElement(txt_addRemove);
        // 2.way
        // Keyboard.Focus(txt_addRemove);
        // 3.way
        // txt_addRemove.Focus();
    }
}

Answer 1

Add this

if (!textBox1.Focus())
   {
       textBox1.Focus();
   }

What this does:
1. We check if the textbox is NOT focused.
2. If it is not focused, focus the control.

EDIT: How about this:

btn_BC_add.PerformClick()