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

Answer 1

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.");

Answer 2

It looks like it's telling you that you can't do an Items.Add() to lstEmployees when you've set the DataSource on lstEmployees and called DataBind().

Without more code I can't say more.

Answer 3

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.