c# - Retrieve checked Items in checkedListBox from text file -

i have text file 1 word per line represents checkedlistbox have checked previously. when application re-run want checkedlistbox items checked, i've tried:

system.io.streamreader file = new system.io.streamreader(@"checked.txt"); foreach (var checked in file.readline()) {                       lstcheckbox.setitemchecked(checked, true); } 

this doesn't seem work, whilst debugging application crashes, ideas i'm going wrong?

error:

    invalidargument=value of '97' not valid 'index'.     parameter name: index 

fixed

foreach (var checked in file.readalllines(@"checked.txt")) {     int index = lstcheckbox.items.indexof(checked);      if (index > 0)     {         lstcheckbox.setitemchecked(index, true);     } } 

this because readline returns single line, , you're iterating characters in line.

string line; while ((line = file.readline()) != null) {     var index = int.parse(line);     lstcheckbox.setitemchecked(checked, true);   } 

should fix problem.

alternatively, use following code instead (not using streamreader).

foreach (var line in file.readalllines("checked.txt")) {     var index = int.parse(line);     lstcheckbox.setitemchecked(checked, true);       }