How to validate integer and float input in an ASP.NET textbox

Question

I am using the code below to validate integers and floats in ASP.NET, but if I do not enter decimal then it gives me an error.

 <asp:TextBox ID="txtAjaxFloat" runat="server" />
 <cc1:FilteredTextBoxExtender ID="FilteredTextBoxExtender1" TargetControlID="txtAjaxFloat" FilterType="Custom, numbers" ValidChars="." runat="server" />

I also have the regular expression from What's a C# regular expression that'll validate currency, float or integer?, but it's giving a validation error if I enter only one value after the decimal..

Dead account · Accepted Answer · 2010-03-04 11:01:13Z

5

Use ControlValidators.

For example (from the link)

<asp:textbox id="textbox1" runat="server"/>
<asp:RangeValidator id="valRange" runat="server"
    ControlToValidate="textbox1"
    MaximumValue="12/31/1998"
    MinimumValue="1/1/1998"
    Type="Date"
    ErrorMessage="* The date must be between 1/1/1998 and 12/13/1998"
    Display="static">*</asp:RangeValidator>
>

The Type attribute can be one of "String", "Integer", "Double", "Date" or "Currency"

answered Mar 4, 2010 at 11:01

Dead account

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1 Comment

Majid Over a year ago

link is not relevant.

Peter Mortensen · Accepted Answer · 2011-04-15 12:20:09Z

2

You can try the following.

<asp:TextBox ID="TextBox2" runat="server" Style="z-index: 103; left: 289px; position: absolute; top: 132px"></asp:TextBox>
<cc1:FilteredTextBoxExtender
    ID="FilteredTextBoxExtender1"
    runat="server"
    TargetControlID="TextBox2"
    ValidChars="0123456789.">
</cc1:FilteredTextBoxExtender>

edited Apr 15, 2011 at 12:20

Peter Mortensen

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answered Mar 4, 2010 at 12:38

kranthi

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Comments

famousgarkin · Accepted Answer · 2014-07-08 18:42:45Z

1

<asp:RegularExpressionValidator
    ID="RegularExpressionValidator6"
    runat="server"
    ControlToValidate="TBHd"
    ValidationExpression="([0-9])[0-9]*[.]?[0-9]*"
    ErrorMessage="Invalid Entry">
</asp:RegularExpressionValidator>

edited Jul 8, 2014 at 18:42

famousgarkin

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answered Jul 8, 2014 at 17:59

Logical

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Comments

Dead account · Accepted Answer · 2010-03-04 11:00:02Z

0

How about plain simple parsing? E.g.

int i;
if (!int.TryParse(txtAjaxFloat.Text, out i))
   i = 0;

float f;
if (!float.TryParse(txtAjaxFloat.Text, out f))
   f = 0;

Where 0 is your default "could not validate" value.

edited Mar 4, 2010 at 11:00

Dead account

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answered Mar 4, 2010 at 10:35

adrianos

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Comments

Gulfam Raza · Accepted Answer · 2021-07-19 08:00:59Z

0

we can use CompareValidator with Datatypecheck Operator to checkbox the datatype of the text in the textbox.

<asp:CompareValidator ID="CValid" runat="server" ControlToValidate="txtName" Display="Dynamic" ErrorMessage="Float value required." Operator="DataTypeCheck" SetFocusOnError="True" Type="Double"></asp:CompareValidator>

edited Jul 19, 2021 at 8:00

answered Jul 19, 2021 at 5:23

Gulfam Raza

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1 Comment

Grigory Zhadko Over a year ago

Providing just a piece of code without any comment is not the best practice of answer. Please add a couple of words to your code.

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