How to bind a CheckBox to a bool typed DbColumn that is nullable?

Question

In Windows Forms (.NET 2.0, Visual Studio 2005 SP1) : I have a typed DataSet, with a column which type is System.Boolean, which is nullable and whi

Answer 1

The easist way I know, is derive from CheckBox class, add "DataValue" property which can handle DBNull values and bind the data to "DataValue" property:

public class DataCheckBox : CheckBox {
    public virtual object DataValue {
        get { return this.Checked; }
        set {
            if ( value == null || value is DBNull ) {
                this.CheckState = CheckState.Indeterminate;
            }
            else {
                this.Checked = (bool)value;
            }
        }
    }
}