I have a Combobox, I want to "Change in place" the selected value in comboBox in c#, and I get its data from the database. When I select an item from combobox, I want to edit in place and change it, I do that by clicking Update Button to change it. But it doesn't work!
SpmoDataBase.Instance.PhoneType.PhoneType_Edit(cmbPhoneTypeEdit.Text);
the error is:
NullReferenceException Class
Object reference not set to an instance of an object.
