How do I make combobox editable

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My form has the combobox which reads the user input , i want to allow the user to enter his own choice apart from the once in the dropdown list.When i run the application i am getting the exception object reference not set to an instance of object.

What I have tried:

i have set the following properties
AutoCompleteCustomSource to Collection
AutoCompleteMode to SuggestAppend
AutoCompleteSource to CustomSource

Posted 27-Jan-17 21:15pm

Member 11790928

Updated 16-Feb-17 20:04pm

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Richard MacCutchan · Answer 1 · 2017-01-27T22:27:00

Solution 1

object reference not set to an instance of object.

Then you need to use your debugger to find out where and why. It is impossible for anyone to guess which variable in your code is not being initialised correctly.

Posted 27-Jan-17 22:27pm

Richard MacCutchan

Member 11790928 · Answer 2 · 2017-02-16T20:04:00

Solution 2

i got the solution just by setting combobox.Text="string name" instead of using combobox.SelectedItem.Tostring().

Posted 16-Feb-17 20:04pm

Member 11790928

Comments

Philippe Mori 18-Feb-17 10:07am

That answer does not make any sense. You are replacing code is reading text with code that is writing text. And obviously if you use SelectedItem then you must be sure that one item is selected. By the way, the debugger would immediately show you the line where the exception occurs and then it is almost trivial to figure out the problem.