How to Not allow more than maximum length and special characters in multiline textbox

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I am having a text box which is multiline so the default maxlength doesnot work, how can i overcome this such that it should not allow more characters than maxlength and also should not allow special characters in that textbox

Posted 7-Mar-13 3:06am

sagarjainhr

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**Orcun Iyigun** · Answer 1 · 2013-03-07T03:12:00

Solution 1

For maxlength you can use TextChanged event and count the characters there. If the char count is the max block user to enter the char or delete the last entered char.

For not allowing special characters use: AjaxControlToolKit's FilteredTextBoxExtender

<asp:FilteredTextBoxExtender ID="fteDate" runat="server" TargetControlID="txtBeginDate" ValidChars="0123456789-/."></asp:FilteredTextBoxExtender>

Good luck,
OI

Posted 7-Mar-13 3:12am

Orcun Iyigun

Updated 7-Mar-13 3:13am

v2

Comments

sagarjainhr 7-Mar-13 9:18am

This asp filter will work on click event but I want the textbox should inform dynamically or should not take that element at all

Orcun Iyigun 7-Mar-13 9:57am

It should work dynamically not just on click event. I think there is something wrong on your implementation. Also have a look at this page: Numbers and Characters only Textbox Validation in C# ![^]