Validate radio buttons and check boxes in C#

Question

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I hope someone will be able to assist me.

I have a try catch statement on the submit button hoping to validate a series of radio buttons and check boxes.

It goes as follows:

C#

try
{
if (btnButton1.Checked == "")
{ throw new Exception("Please provide a rating"); }
}

catch (Exception ex)

{
Response.Write(ex.Message);
}

From the message it appears the operator cannot be used, and I am also not sure about the .Checked option I chose.

Please assist.

Thank you.

Posted 16-May-12 21:36pm

ArnoldVDH

Updated 16-May-12 21:39pm

Sandeep Mewara

v2

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6 solutions

Solution 3

C#

if (!btnButton1.Checked)
{
 throw new Exception("Please provide a rating"); }
}

Posted 16-May-12 22:04pm

KM Perumal

Updated 16-May-12 22:59pm

v2

Comments

Oshtri Deka 17-May-12 4:59am

Edit: ! operator

Solution 2

Try using:

C#

if (btnButton1.Checked == Checkstate.Checked)

Posted 16-May-12 21:55pm

Mendor81

Updated 16-May-12 22:04pm

v2

Solution 5

C#

try
{
  if (!btnButton1.Checked == true)
     {
       throw new Exception("Please provide a rating");
     }
}
 
catch (Exception ex) 
{
   Response.Write(ex.Message);
}

Try this 1. Hope it helps. :)

-dabeeyow

Posted 16-May-12 22:13pm

dabeeyow

Solution 6

RadioButtion always return true when checked and return false if uncheck.

make a good practice for naming controls.

According to you if there are radio buttons and check boxes in your form better to name like rbGender.Checked rather using btnButton1.Checked.

C#

if(rbGender.Checked==true)
{
//do what you want when checked
}
else
{
//do what you want when not checked
}

mark it answer if solves your problem and dont forget to rate..

Thanks

Posted 16-May-12 23:05pm

AshishChaudha

Solution 4

Super! Thank you for this. I replaced the empty string with false and that particular problem worked well now.

So I tried testing this by not selecting a radio button and the message "Please provide a rating" was returned.

However, I still got this message when I did select a radio button.

I'm sure I'm missing something basic here.

Posted 16-May-12 22:05pm

ArnoldVDH

Comments

Jim Jos 17-May-12 5:03am

Please use step by step debugging and find out where the exception is generated.. Exception is the mother of all exceptions and you are using it to show your radiobutton error. Best thing is creating your own exception called RadioButtonNotClickedException and try it out..

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OriginalGriff · Accepted Answer · 2012-05-16T21:48:00

Solution 1

The RadioButton.Checked property is a bool : true if checked, false if not.
So comparing it against an empty string is never going to work...

Posted 16-May-12 21:48pm

OriginalGriff

Comments

Member 14189690 20-Mar-19 11:32am

I have similar question. I have around 70 radio buttons. I want to check if all the radio buttons are checked then to submit something. If one single radio button is not checked then don't submit anything until the user checks that button

OriginalGriff 20-Mar-19 11:54am

Why do you think that having 70 radio buttons on the same form is a good idea?
Do you think the user wants to check that many in one go?

You can do it - just loop through all the radio buttons on the parent container - but from a user interface POV it's a pretty poor solution. I probably wouldn't use your app twice, if you know what I mean ...

Member 14189690 20-Mar-19 12:04pm

I am doing evaluation project. So I have a questionnaire containing 15 question on which user has to select one option from 1 to 5. I use radio buttons for those options. But how to prevent submitting those answers if there is one unchecked radio button

OriginalGriff 20-Mar-19 12:14pm

I have to say that sounds like a "student solution" - and that's not a good thing! :laugh:

When was the last time you saw an electronic survey with 15 questions on the same form or page?
It's a bad idea because it's a "lump" to look at - and that intimidates people, and will mostly cause them to close the app and go do something less boring. Two, three questions per page (or even one if the question text is more than a short sentence) is much better from a psychological POV - provided you give an idea how far through they are - and allows you to skip irrelevant options.

Member 14189690 20-Mar-19 12:22pm

I get you. But its not my call on the questions. I was given the template and I have to implement it. So, back to the question on validating before submitting, any solution?

OriginalGriff 20-Mar-19 12:28pm

Read what I said half an hour ago.

Member 14189690 20-Mar-19 12:34pm

Thank you for no help offered. Focus on what I asked and not on what or how to implement something else. Have a good one.

OriginalGriff 20-Mar-19 12:37pm

So you are ignoring the "You can do it - just loop through ..." bit and just going off in a huff?

Bye!