NextControl Focus using Enter and Previous Using Backspace in TextBox

Question

I am using the following code for goto next and previous controls in windows form

if (e.KeyCode == Keys.Enter)//Next
{
    this.SelectNextControl(this.ActiveControl, true, true, true, true);
}
if (e.KeyCode == Keys.Back)//Previous
{
    this.SelectNextControl(this.ActiveControl, false, true, true, true);
}

The problem in

if (e.KeyCode == Keys.Back)

If current control is a TextBox and the user tries to type and delete one word using backspace, that time this will work and set the focus to the next control.

How to prevent this event when textbox have some values? And it should work for ComboBox and other controls

surround it with `if(string.IsNullOrWhitespace(textbox.Text))` — Kamil Budziewski, Jul 25 '13 at 06:14
if its one textbox means your answer is correct but the form have more number of textbox @wudzik — Suresh, Jul 25 '13 at 06:25

LjCode · Answer 1 · 2016-09-07T13:50:46.597

1

Another update, probably not as good, but works. I would recommend creating a method:

public void checkKey(object sender)
{
    KeyEventArgs a = new KeyEventArgs(Keys.Back);
    if (sender.GetType().Name == "TextBox")
    {
        TextBox tb = (TextBox)sender;
        if ((a.KeyCode == Keys.Back && String.IsNullOrWhiteSpace(tb.Text)))
        {
            this.SelectNextControl(this.ActiveControl, false, true, true, true);
        }
    }
}

And then on all the textboxes TextChanged events call checkKey(sender);

If you need to add controls, just add it in the if condition.

The event that you are using checks if a key on the Form is pressed and not on the textbox.

edited Sep 07 '16 at 13:50

answered Jul 25 '13 at 06:40

LjCode

292
2
12

I doubt it, needs some modifying to do that as well. – LjCode Jul 25 '13 at 07:48
but how? @Luame Ludik – Suresh Jul 25 '13 at 07:59
using the `object sender` will determine what type of control is sending the event. textbox in this case. will work anywhere in the form **including** groupboxes. – LjCode Jul 25 '13 at 08:26
`if (e.KeyCode == Keys.Back) { if (sender.GetType().Name == "TextBox") { TextBox tb = (TextBox)sender; if ((e.KeyCode == Keys.Back && String.IsNullOrEmpty(tb.Text))) { this.SelectNextControl(this.ActiveControl, false, true, true, true); } } else this.SelectNextControl(this.ActiveControl, false, true, true, true); }` in this code not working(textbox and combobox are there) – Suresh Jul 25 '13 at 08:33
Ok, made another change, probably not as fast, but it works. (tested) – LjCode Jul 25 '13 at 09:08

sourabh devpura · Answer 2 · 2013-07-25T06:33:45.907

0

Most people use reverse tab for back in win form . but if you still want to do it by back button .

This cod will help you . and you never loss your lest char .

if(e.KeyCode==Keys.Back)
            {
                if(textBox1.Text.Trim().Length==0){
                this.SelectNextControl(this.ActiveControl, false, true, true, true);
                }
            }

it my pleasure to help you . welcome for your thanks

edited Jul 25 '13 at 06:33

answered Jul 25 '13 at 06:26

sourabh devpura

605
8
25

my question is if user try to type "good" in textbox but sometimes it goes "godo" so, he try to delete using backspace, so that time no need of this event, if textbox is empty then only this event must works – Suresh Jul 25 '13 at 06:30
1

i just edit my answer . now this will work only when the text box is empty – sourabh devpura Jul 25 '13 at 06:34
the problem in "textbox1.text", because we cant specify its textbox1 because more textbox are there @sourabh devpura – Suresh Jul 25 '13 at 06:36
is this answer is useful . please rat this – sourabh devpura Jul 25 '13 at 06:38
1

i just post a new answer . see it and tell me is this ok or not – sourabh devpura Jul 25 '13 at 06:42

score 0 · Answer 3 · answered Jul 25 '13 at 06:42

0

ok then first create a new function

public TextBoxBackEvent(TextBox tb,Form form){
               if(tb.Text.Trim().Length==0){
                form.SelectNextControl(form, false, true, true, true);
}

now use this function in any where in your application

like

  TextBoxBackEvent(textbox,this);

and it will work exactly witch you want

answered Jul 25 '13 at 06:42

sourabh devpura

605
8
25

"textbox" what it means in this operation. is it will check all textboxes – Suresh Jul 25 '13 at 06:52
2

this is the text box object . i min you can pass any textbox in this function – sourabh devpura Jul 25 '13 at 06:54

NextControl Focus using Enter and Previous Using Backspace in TextBox

3 Answers3