Web Forms :: How To Add Validation So It Doesn't Accept Empty Strings Or Numbers

Jan 6, 2010

i am using a search box for my application which returns a dataset. however when i click on the search button it returns an empty table result. how could i add validation so it doesnt accept empty strings or numbers.

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Jan 8, 2010

I'm currently stuck with a problem with MVC2 RC and validation on a dropdownlist :

I have a page with some fields and a dropdownlist. The dropdownlist is not a mandatory field so I would like to save a null value into my property.

Unfortunately, I can't validate my page with a null selected value, because when I look into the modelstate just on the first line of my action, I've already an error telling me I must choose an item.

Is it normal working of dropdownlist validation or is it a bug ?

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Web Forms :: Textbox Validation Code Doesn't Run When Textboxes Are Empty?

Jan 13, 2011

I want the validation condition to be: on a pair of textboxes, to be valid as long as at least one of them isn't empty.

So I put a customvalidator on the 2nd textbox, hooked up to the following server code and client code:

<script type="text/javascript">
function ECPhoneOrEmailRequired(source, args) {
var ecPhone = document.getElementById("txtEmergencyPhone");
var ecEmail = document.getElementById("txtEmergencyEmail");
if (ecPhone.value.length < 1 && ecEmail.value.length < 1) {
args.IsValid = false;
else {
args.IsValid = true
Protected Sub CustomValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs)
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End If
End Sub

From what I can tell thru breakpoints, this code works fine as long as there's something in one of the two textboxes. When both textboxes are empty, the code is never called - and so both boxes empty ends up being allowed.

So what's the correct way to validate one-or-the-other-nonempty condition?

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Oct 19, 2010

i want a text box in asp that should take only numbers if we enter alphabets or special characters that should give an error how can i achive this

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Web Forms :: Validation To Accept Only Alphabetic Characters

Jun 1, 2012

there is a text box in my form to input name.. I apply regular expression to accept only characters ... but it is not accepting space.

i apply this regular expression

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Web Forms :: RangeValidator Doesn't Accept Integer With Group Separator?

Sep 20, 2010

I need to validate integer within a specified range for English and French culture. The integer contains group separator ("," in English culture or " " in French culture). It seems I can't do it with RangeValidator on my machine.

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I just feel curious because RangeValidator can actually do this kind of validation for Currency!

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Jun 23, 2010

I have an invoice form where user enters items and amount. I am calculating the amount as the user enters amount in the textfield. I receive an error (Input String was not in correct format) if user enters amount with comma separated values. If there are no commas, my calculation goes through fine.

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MVC :: Insert Empty Strings Into Database?

Apr 2, 2010

Using MVC 2 and VS 2010 RC.I have a varchar database column set to NOT NULL and I use the Entity Framework to bind the column to a textbox. I want a user to be able to leave the textbox blank and have an empty string inserted into the database column. However, MVC is trying to set the property to null during the Create postback, which causes ModelState.IsValid to be false and subsequently the validation UI is triggered with the message "The value '' is invalid".Here is the model:


The controller:

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.NET - SQLDataSource - FilterExpression - Empty Strings?

Jan 19, 2010

In this test application, I am filtering by two ControlParameters. As you can see in the first codeblock, both parameters have a default value of %. This code works great. However, in the second code block, please note that the Default Values are eliminated. The second code block works as long as neither Textbox's text is blank. For some reason, when .NET evaluates the filter expression and inserts "" into the expression, it seems to bug out and case none of my results to be filtered.

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Code Block 1:

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Aug 14, 2013

I have one textbox and I want to allow only integer cannot allow character when I entered character to show the error message , this functionality I want create in server side withou using javascript.

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MVC :: Controller.UpdateModel Breaking Change On Empty Strings?

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I have just upgraded a project from MVC 1 to 2 and I have come across an issue with fields updated via UpdateModel which contain an emtpy string.

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My designer.cs file of all the SQL tables is generated by LINQ-TO-SQL. The class and attribute in question is like this.

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I've a form where I'd like to impede the user from entering any alphabits or special characters. The user can only enter numbers between 0 & 3( both inclusive) no more no less.

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MVC :: Server Side Validation Does Not Accept Thousandseparator

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I'm using MVC 3 RTM, client side validation has been disabled.I have a simple model with one integer field.Server side validation does not accept numbers including one or more thousandseparators.

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I am working on a website. I am using C# 2008. I want to make a text box that accept only numbers & comma(,). for example-919981424199,78848817711,47171111747 or there may be a single number like 919981424199.

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Custom Server Controls :: Web User Control Doesn't Accept It's Property

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When i add this control to a page i set it's address with Address property. But it never sets it's address property like this :


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