Get value from selected checkboxes (Checkbox array)

Question

I have a array of checkboxes, 33 in total. Because the checkboxes are all over the page, it needs to be in an array (right?).

The code-behind looks like this:

CheckBox[] variableName = new CheckBox[33];

        variableName[0] = idCheckBox1;
        variableName[1] = idCheckBox1;
        variableName[2] = idCheckBox1;
        variableName[3] = idCheckBox1;

and so on...

ASP.NET:

<asp:CheckBox ID="idCheckBox1" runat="server" Value="1" />
<asp:CheckBox ID="idCheckBox2" runat="server" Value="2" />
...

The checkboxes are totally optional. Now how do i get the value of the checked boxes only in a variable?

MyKuLLSKI · Accepted Answer · 2012-02-02 16:31:25Z

2

It does NOT need to be an array.
This is how you get all the CHECKED checkboxes in your form from the CodeBehind:

var names = formCollection.AllKeys.Where(c => 
                    c.StartsWith("idCheckBox") && 
                    formCollection.GetValue(c) != null &&
                    formCollection.GetValue(c).AttemptedValue == "1");

edited Feb 2, 2012 at 16:31

answered Feb 2, 2012 at 16:16

MyKuLLSKI

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4 Comments

Alexandre Over a year ago

Also, maybe you could benefit from the CheckBoxList Class: msdn.microsoft.com/en-us/library/…

user1057649 Over a year ago

Where did you get 'formCollection' from? If i use my form1, there is no AllKeys.

user1057649 Over a year ago

Alright, in my case 'form1' then... But when i use it like this: var names = form1.AllKeys.Where(c => c.StartsWith("idCheckBox") && form1.GetValue(c) != null && form1.GetValue(c).AttemptedValue == "1"); the AllKey isn't recognized. I'm using System.Collections...

user1057649 Over a year ago

The Linq namespace was already imported :) Well, when i use 'Request.Form.AllKeys', AllKeys is recognized. Strange... (sorry, not a big c# expert ;)

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