Displaying last 4 digits of a textbox in another textbox

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Hi Dear All,

I have two textboxes.. I want to display the last 4 digits of 1st textbox into 2nd textbox using the textchanged event of 1st textbox...

Ex: If I enter 4566456767 in 1st textbox, then 6767 should be displayed in 2nd textbox..

Please any one suggest me how to do this..

Regards,
Raj Bangalore

Posted 29-Mar-11 18:18pm

Raj.rcr

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Sergey Alexandrovich Kryukov 30-Mar-11 0:23am

And why it seems to be a problem? Any effort?
--SA

Raj.rcr 30-Mar-11 0:27am

coding is the problem SA. I can display the same text in 2nd textbox, but dnt knw how to display only the last 4 digits..

Sergey Alexandrovich Kryukov 30-Mar-11 0:37am

Did you try any code? OK, see my comments to the Answer by Mika. You have a chance to improve it...
--SA

2 solutions

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Wendelius · Accepted Answer · 2011-03-29T18:26:00

Solution 1

You wire up the TextChanged[^] event and you can use SubString[^] to get the last 4 digits. For example:

private void textBox1_TextChanged(object sender, EventArgs e) {
    if (textBox1.Text.Length >= 4) {
        textBox2.Text = textBox1.Text.Substring(textBox1.Text.Length - 4);
    }
}

Posted 29-Mar-11 18:26pm

Wendelius

Comments

Raj.rcr 30-Mar-11 0:32am

Thank u Mika...

Sergey Alexandrovich Kryukov 30-Mar-11 0:35am

This is a working solution, my 5, however:
1) this is APS.NET. Wiring every TextChanged event through postback will show poop performance; the alternative would be doing it all on client side via Javascript;
2) requirement is "4 digits", not "4 characters", so some extra code required.
3) I would add something like:
} else textBox2.Text = "What the hell are you doing? There is not 4 digits here!"
:-)

--SA

Wendelius 31-Mar-11 14:35pm

Good points, thanks :)

Mahendra.p25 · Accepted Answer · 2011-03-29T18:29:00

Solution 2

iam giving you example

try this

string str = "HelloWorld";
TextBox1.Text=str.Substring(str.Length - 4);

Posted 29-Mar-11 18:29pm

Mahendra.p25

Comments

Raj.rcr 30-Mar-11 0:33am

Thank u Mahen...