c# - List in class is null even though I made an instance of the class -

c# - List in class is null even though I made an instance of the class -

i'm trying access list personal functions in main programme maintain getting it's not instance of...

the class code:

[serializable()] class faktnr { public int lopnummer; public int year; public list<string> personal = new list<string>(); public faktnr() { personal = new list<string>(); } }

the form code:

public partial class form1 : form { internal faktnr faktnr = new faktnr(); public form1() { initializecomponent(); } private void laggtillperson_click(object sender, eventargs e) { faktnr.personal.add(combobox1.text); }

code shortened here shows essentials. nullreferenceexception occurs in function laggtillperson_click.

i want add together not combobox problem since tried this: faktnr.personal.add("uhiouh");

you getting exception on combobox1.text, combobox1 null, not list personal, seek replacing code with:

faktnr.personal.add("test string");

and see if still exception.

you accessing text property of combobox, instead may utilize combobox.selectedtext property

or can check null in event:

private void laggtillperson_click(object sender, eventargs e) { if(combobox1 != null)           faktnr.personal.add(combobox1.text); }

c# winforms