Question

I am populating a data table which in turn populates a checkboxlist. I want the items to be selected when they are added. I can do this, however when I add a 2nd -> nth Item, it only keeps the last check box. Is there a way to persist selected check boxes through a bind? here is my current function:

protected void FinalizeAdd_Click(object sender, EventArgs e)
{

    VersionDataTable.AddVersionDataTableRow(Convert.ToInt32(VersionDropDown.SelectedValue), ProductDropDown.SelectedItem.Text + " " + VersionDropDown.SelectedItem.Text);

    ProductCheckList.DataSource = VersionDataTable;

    ProductCheckList.DataValueField = VersionDataTable.VersionIDColumn.ToString();
    ProductCheckList.DataTextField = VersionDataTable.VersionTextColumn.ToString();
    ProductCheckList.DataBind();

    ProductCheckList.Items[ProductCheckList.Items.Count - 1].Selected = true;
}

Thanks for the help in advance.

Answer 1

You have to save the selected items before you databind the CheckboxList again.

For example(sorry for VB.NET, but i think you’ll understand what i mean):

Dim oldSelection = (From item As ListItem In ProductCheckList.Items
                    Where item.Selected).ToList
' databinding '
If oldSelection.Any Then
    For Each selectedItem In oldSelection
        Dim item = ProductCheckList.Items.FindByValue(selectedItem.Value)
        If Not item Is Nothing Then
           item.Selected = True
        End If
    Next
End If