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

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"

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

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>

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

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

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

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.

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

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>

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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