Autogenerate 10 Digit number

Angel Princess

12y1.4kLearn iOS Programming

When i enter 12 in textbox it should convert into 0101010112

randomaly when i enter 134 it should convert into 0101010134

in windows form

10 Replies

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Vulpes12y ago
I can only think that you didn't make the padding string long enough to start with - I made it 10 characters long to be on the safe side.

Anyway, glad it's working now :)
Angel Princess12y ago
Yes its working now .. Thanks a lot.

the error was
Index and length must refer to a location within the string.
Parameter name: length
Angel Princess12y ago
Yes its working now .. Thanks a lot.
Jignesh Trivedi12y ago
hi,

I have test vulpes code it working fine for me....
What error are you getting? can you please share error text?
Angel Princess12y ago
Thanks Vulpes.. but it gives error when entering 2 digits.. more than 2 digits, it is working successfully
Vulpes12y ago
If you mean that you want to 'pad left' whatever is entered in the textbox with as many characters of the string "0101010101" as are needed, then this code should do it:

int len = textBox1.Text.Length;
if (len < 10)
{
string padding = "0101010101";
textBox1.Text = padding.Substring(0, 10 - len) + textBox1.Text;
}
Jignesh Trivedi12y ago
hi,

Is it true what ever Munesh says?
so can you please provide more information? what is logic etc...
Angel Princess12y ago
Yes the digits should remain 12 only
Munesh Sharma12y ago
no Jignesh Trivedi i also thinked like this but this is not question you see in question 0101010112 (here he is enter 12 and prefix is 01010101), 0101010134 (here he is enter 134 and prefix is 0101010).. so prefix is changing.
Jignesh Trivedi12y ago
hi,
I think 01010101 is prefix right?
so in this case you can write textbox lost focus event and in this event you can add this prefix
textbox1.Text = "01010101" + textbox1.Text;
hope this will help you.