Windows Form Combobox fires SelectionChangeCommitted, SelectedValueChanged and SelectedIndexChanged event when application looses focus

Answer 1

The code looks perfect. The issue maybe because of bug in .net framework. Can some expert confirm this ?

One workaround to avoid the exception is - store default value of "ProductType" proptery if SelectedValue is NULL.

For example, if default value of ProductType is -1 then,

cmbProduct.DataBindings["SelectedValue"].DataSourceNullValue = -1; 

Hope, this helps!

Robin