get
{
switch (Checked)
{
case CheckedState.Checked: return true;
case CheckedState.Unchecked: return false;
case CheckedState.Blank:
default: return null;
}
}
set
{
Checked = value == null ? CheckedState.Blank : value.Value ? CheckedState.Checked : CheckedState.Unchecked;
}

#endregion
}

As far as setting the 3-way state using a nullable boolean value, that should be easy as well. Something like this should suffice; (where myBitField is a nullable boolean, (bool? myBitField)):

myCheckBox.Checked = myBitField == null ? CheckedState.Blank : myBitField.Value ? CheckedState.Checked : CheckedState.Unchecked;

And then just reversing that the other way to get the value back out. You could also scrap the enumeration and simply use a Nullable property instead, blank = null, checked = true, unchecked = false. It should be fairly simple to switch the binding from the enumeration with the hidden field (which can have a blank string as its value anyway).

Thanks,
Chad

rgds, George

Thanks for a great control!

josh

Glad to hear you like the control. I’ve not personally tried to place this control in a databound control like a DataGrid, GridView or any 3rd party grids such as ComponentArt or Infragistics, although I love these control libraries personally.

Basically the principles are all the same for these controls. They have one or more ITemplate containers that house a group of child controls that get created during data binding at run-time.

I’ve implmented the INamingContainer interface for the 3-state check-box which should allow it to easily be placed into other naming containers or data bound controls such as DataGrids or Repeaters, etc.

My suggestion would be to try it out in a simple Repeater control. If it works in there, step it up until you reach a more complex grid control such as the one you’re using from ComponentArt. If it doesn’t work in the Repeater then there is an issue with my implementation of INamingContainer or the ScriptManager reference(s).

I’ll take a look at it later this week and try it in several data bound repeating controls and see what I can turn up.

Thanks again for the feedback!

~ Chad

Thanks…