Question

There isn’t the attribute Value :

<asp:CheckBox ID="CheckBox1" runat="server" />

while on standard HTML this is allowed :

<input type="checkbox" ID="CheckBox1" value="My Valyue" />

why?

Answer 1

The Text property is used to render a label for the checkbox.

The control has an InputAttributes property that you can add to:

myChk.InputAttributes.Add("value", "My Value");

I believe that if you simply add the value attribute to the markup, this will also get populated.

You can access the value like so:

myChk.InputAttributes["value"];

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To answer the question of why Value is not a build in attribute to the CheckBox control:

A CheckBox in isolation (just by itself) needs no value. By definition it is a boolean and is identified by its ID. All you need to do is check whether it was checked or not.

The value comes into play when you group checkboxes and there is a control for that – the CheckBoxList that uses ListItem – each ListItem does have a Value property.