Re: textBox TextChanged method - C# Discussion Boards

20-Apr-15 0:40

I have a textBox where i want to insert a string in a licence model (fdsf-dfss-fdfd-fdhd). I tried to select first 4 char and when I have 4 chars, is inserted "-". But it starts from the beginning when "-" is inserted after first 4 chars. This is how I tried:

private void textBox4_TextChanged(object sender, EventArgs e)
        {
            for (int i=0;i<=textBox4.Text.Length;i++) 
            {
                while (textBox4.Text.Length == 4)
                {
                    textBox4.Text += "-";
                }
            }
        }

How can I make like after I have 4 chars and "-" is inserted, to be able to continue inserting the text after "-" ?

Kenneth Haugland20-Apr-15 0:45

Kenneth Haugland

20-Apr-15 0:45

Ditch the while in there, and use Mod (%) instead, so each time its devicible by 4 you add the '-' sign in front of the next char.
https://msdn.microsoft.com/en-us/library/0w4e0fzs.aspx[^]

DPaul199420-Apr-15 0:56

20-Apr-15 0:56

Thank! I will try it

Sascha Lefèvre20-Apr-15 0:48

20-Apr-15 0:48

Change it to:

textBox4.Text += "-";
textBox4.SelectionStart = textBox4.Text.Length;

..in order to set the input cursor to the end of the text again.

Unrelated suggestion: Give your TextBoxes and all other controls a name that explains their purpose - in this case maybe "LicenceInput". That will make it much easier to read your code, even for yourself, after you haven't worked on it for a while Smile | :)

edit: A MaskedTextBox might be the most convenient way to handle this. The input mask would be: 0000\-0000\-0000\-0000

If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson

modified 20-Apr-15 7:15am.

DPaul199420-Apr-15 0:56

20-Apr-15 0:56

it works, but after I insert another 4 characters, "-" is not inserted.

Sascha Lefèvre20-Apr-15 1:01

20-Apr-15 1:01

Please edit your original post and add your reworked code in a second code-block.

If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson

Sascha Lefèvre20-Apr-15 1:19

20-Apr-15 1:19

On second thought, the modulo operator-approach isn't really well suited here, because due to inserting the dashes, the length of the text won't be a multiple of 4 at the positions where the next dash should be inserted. I would recommend a MaskedTextBox instead with an input mask like 0000\-0000\-0000\-0000

If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson

DPaul199420-Apr-15 3:13

20-Apr-15 3:13

I can insert only numbers..

Sascha Lefèvre20-Apr-15 3:22

20-Apr-15 3:22

Oh, sorry. If you want to insert only letters, then change the zeroes to 'L' , if you want to allow letters and digits, then change them to 'A'. And if you want to prevent "unusual" letters then also set the property AsciiOnly of the MaskedTextBox to true.

https://msdn.microsoft.com/en-us/library/system.windows.forms.maskedtextbox.mask%28v=vs.110%29.aspx[^]

If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson

DPaul199420-Apr-15 3:20

20-Apr-15 3:20

Is ok, I solved it. Thank you !

Sascha Lefèvre20-Apr-15 3:23

20-Apr-15 3:23

Too late I already replied ;o)

You're welcome!

If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson

Arkadeep De20-Apr-15 0:49

Arkadeep De

20-Apr-15 0:49

is this a web app or windows app? If it is windows then you can use Masked Input and if it is web then you can use Jquery, don't need to hit server every time..

Arkadeep De
ASP With Arka
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DPaul199420-Apr-15 0:55

20-Apr-15 0:55

Is win form. I will try, thanks!

Arkadeep De20-Apr-15 1:15

Arkadeep De

20-Apr-15 1:15

ya sure...

Arkadeep De
ASP With Arka
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Simon_Whale20-Apr-15 3:21

Simon_Whale

20-Apr-15 3:21

I've used masked textbox many times, just remember to set the mask and it will do all the work for you.

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Member 1121840320-Apr-15 0:05

Member 11218403

20-Apr-15 0:05

How Can I Export Database From Sql Server To Sql Server Ce

Re: C#

Sascha Lefèvre20-Apr-15 0:10

Binary tree and BTree are not same

20-Apr-15 0:10

Oh, look, what I got by googling "Export Database From Sql Server To Sql Server Ce":

http://erikej.blogspot.de/2012/02/migrating-databases-between-sql-server.html[^]
SQL Server to SQL Server Compact Edition Database Copy Utility[^]

If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson

Tridip Bhattacharjee19-Apr-15 23:00

Tridip Bhattacharjee

19-Apr-15 23:00

one guy said "In a binary tree a node has at most 2 children, that's why it's called binary. In a B-Tree a node can have more than 2 children, up to a certain limit that depends on the implementation."

here is the url https://social.msdn.microsoft.com/Forums/vstudio/en-US/02ce17eb-ad55-48e1-85b9-d145bb59ab58/like-to-see-few-real-life-usage-of-binary-tree-c?forum=csharpgeneral[^]

just tell me with good example like the difference between Binary tree and BTree.

all .net colletion related class follow the BTree algo ?

tbhattacharjee

Re: Binary tree and BTree are not same

Eddy Vluggen20-Apr-15 0:19

Eddy Vluggen

20-Apr-15 0:19

Tridip Bhattacharjee wrote:
all .net colletion related class follow the BTree algo ?

None.

Usefull for harddisks with slow access time. What tree are you looking for, and what would you expect it to do? Or did you come across it and become interested? In that case, there's a lot more variants Smile | :)

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If you can't read my code, try converting it here[^]

Re: Binary tree and BTree are not same

Sascha Lefèvre20-Apr-15 0:29