c# - Don't know how contains works to remove duplicates -


trying see if number in listbox, if not add it.

i've had around i'm getting confused. tried using contains i'm using invalid arguments, how tell i'm doing wrong?

public void sorteven() {     string userinput = textbox1.text;     string[] numberarray = userinput.split(',');     foreach (string in numberarray)     {         int x = int32.parse(i);         if (x % 2 == 0)         {             if (!listbox1.items.contains(i)) //error here, says invalid arguments             {             listbox1.items.add(i);             }         }     }

if there better/more efficient alternative i'm doing, love know too.

do want add distinct numbers in listbox?

you try

foreach (string in numberarray.distinct()) {     int x = int32.parse(i);     if (x % 2 == 0)     {         listbox1.items.add(i);     } }

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