public CardViewColumn Column { get; }

Public ReadOnly Property Column As CardViewColumn

<ASPxCardView ID="ASPxCardView1" onHeaderFilterEditorInitialize="ASPxCardView1_HeaderFilterEditorInitialize">
    ...
</ASPxCardView>

protected void ASPxCardView1_HeaderFilterEditorInitialize(object sender, ASPxCardViewHeaderFilterEditorInitializeEventArgs e) {
    if (e.Column.FieldName == "ProductName"){
        // your code
    }
}

settings.HeaderFilterEditorInitialize = (s, e) => {
    if (e.Column.FieldName == "ProductName"){
        // your code
    }
};