Item cannot be added to a read-only or fixed-size list

Question

I am using bindingsource . The problem is that when i do AddNew() in binding source then it give me the exception Item cannot be added to a read-only or fixed-size list. This form is Dialog. For your review i am adding the code

Main Form Code

private void bindingNavigatorAddNewItem_Click_1(object sender, EventArgs e)
{
    try
    {
        this.Validate();
        _earning = (Earning)this.earningBindingSource.Current;
        string EmpNo = Convert.ToString(_earning.Empno == null || _earning.Empno == string.Empty ? "0" : _earning.Empno);
        Incomes.frmIncomeAddList _earnEmployee = new Incomes.frmIncomeAddList();
        _earnEmployee.ShowDialog();
    }
    catch (Exception ex)
    {
    }
}

This is the Dialog Form Code

public frmIncomeAddList( )
{
    InitializeComponent();  

    FillCurrency();

    FillDropdown();
    FillEarnCode();
    FillEarnCodeDESC();

    this.earningBindingSource.AddNew();

    this.earningBindingNavigatorSaveItem.Enabled = true;

    FillDropdown(); 
}

on Dialog Form this.earningBindingSource.AddNew(); i am getting exception Item cannot be added to a read-only or fixed-size list.

Can you please help me. Thank's in advance

It's obvious that your BindingSource is bound to fixed size or read-only list. You should change the underlying datasource to make it editable or variable. — King King, May 29 '13 at 15:08
but i am doing `this.earningBindingSource.AddNew();` here i am doing for `.AddNew()` — A.Goutam, May 30 '13 at 06:27
I supposed your earningBindingSource is typeof BindingSource and AddNew() will do some adding new row to the underlying data source. — King King, May 30 '13 at 09:25
Change your underlying datasource, if you declare it as readonly it can't be changed anyway. I don't know exactly what your datasource is so it's better to update your question to help others see what your datasource is. I usually create my datasource as DataTable. What about yours? — King King, May 30 '13 at 11:32

score 1 · Answer 1 · answered Feb 03 '15 at 12:01

1

Try this approach:

List<Earning> earnings = ((IEnumerable<Earning>)earningBindingSource.DataSource).ToList();
earnings.Add(new Earning());
earningBindingSource.DataSource = earnings.AsEnumerable();

answered Feb 03 '15 at 12:01

Hargoth

11
4

score 1 · Answer 2 · edited Jan 22 '16 at 09:13

1

when parent table has no record, and add new row in child table then show this error.

Item cannot be added to a read-only or fixed-size list

edited Jan 22 '16 at 09:13

Robert

5,278
43
65
115

answered Jan 22 '16 at 08:55

software finestardiamonds

11
1

score 1 · Answer 3 · answered Feb 23 '19 at 23:59

1

Make sure that YourBindingSource.AllowNew = true;

Or from properties window of the BindingSource:

It worked for me..

answered Feb 23 '19 at 23:59

Ahmed Suror

439
6
17

Item cannot be added to a read-only or fixed-size list

3 Answers3