"Items collection cannot be modified when the DataSource property is set." [closed]

Question

Having this issue with a program that adds files through a form to a txt file but the issue doesn't say anything about Fstream so i'm thinking it doesn't have to deal with it but i'm not sure what this problem means.

lstEmployees.Items.Add("No records found.");

Answer 1

The error message tells us that you have set the "DataSource property" on "lstEmployees". So go to "lstEmployees" properties and remove the DataSource - or if you want to keep the DataSource, don´t try to add "your own" items to "lstEmployees", as it won´t be accepted.

Answer 2

Once you add a .DataSource to your listbox, you cannot modify the ListBox.Items collection. Instead, you can modify the original source.

For example, if your listbox is bound to a generic list of strings:

List<string> myList = new List<string>();
myList.Add("Item 1");
myList.Add("Item 2");
myList.Add("Item 3");

myListBox.DataSource = myList;

// need to add an item to the list after it's bound
myList.Add("No records found.");