Asp.net Text Box Length Limitation

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C#

ASP.NET

I need to limit a textbox with only 50 characters.

ie, user can only enter only 50 characters.

Please help

Posted 3-Feb-11 22:34pm

kishore Rajendran

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justinonday 4-Feb-11 4:57am

<asp:TextBox ID="TextBox1" MaxLength="50" runat="server"></asp:TextBox>

3 solutions

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OriginalGriff · Answer 1 · 2011-02-03T22:35:00

Solution 1

See the TextBox.MaxLength property[^]

Posted 3-Feb-11 22:35pm

OriginalGriff

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Ankur^\m/ 4-Feb-11 5:04am

Correct answer! :)

Sandeep Mewara 4-Feb-11 5:13am

Yes it is, but would not be sufficient for all scenarios.

Ankur^\m/ 4-Feb-11 5:26am

Can you give an example? AFAIK, it works even if JavaScript is disabled.

Espen Harlinn 6-Feb-11 11:14am

Nice and simple

Abhinav S · Answer 2 · 2011-02-03T22:51:00

Solution 2

If you are using a multiline textbox see here[^].

Posted 3-Feb-11 22:51pm

Abhinav S

Updated 3-Feb-11 22:54pm

v2

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Espen Harlinn 6-Feb-11 11:14am

Good link, interesting article :)

Sandeep Mewara · Answer 3 · 2011-02-03T22:54:00

Solution 3

I guess while 'pasting' anything of more than 50 would allow textbox have it even if you have maxlength property set.

Have a look at this approach:
Setting Maxlength via Javascript[^]
Check maxlength of multiline textbox in javascript[^]

Posted 3-Feb-11 22:54pm

Sandeep Mewara

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Coding C# 4-Feb-11 5:10am

I think its not while 'pasting', its while setting from code behind it will allow textbox to have text more than maxlength limit.

However its correct that maxlength won't work in case of multiline textbox, need to use javascript/jquery.

Sandeep Mewara 4-Feb-11 5:12am

As much I remember, it's while pasting too.

Coding C# 4-Feb-11 5:19am

I just tried and it doesn't while pasting...

Sandeep Mewara 4-Feb-11 5:23am

Ok. Thanks for confirming. It must be pasting in Multiline.

Ankur^\m/ 4-Feb-11 5:28am

Your code will fail if JavaScript is disabled. But Maxlength property works for disabled JavaScript as well. Moreover it will work even if you paste a string having length greater than defined length by concatenating the string.

Sandeep Mewara 4-Feb-11 5:32am

Yes Ankur. I/we know. We just discussed that above in comments. The issue is with multiline. Agreed.

Espen Harlinn 6-Feb-11 11:13am

Good effort :)