I have a problem for ini File

Hi Kurt, you can use this C# library to both read and write your ini files.
For example let's say you have something like the following "Sample.ini" content:

[ListBoxItems]
ListBoxItem = Value 1.
ListBoxItem = Value 2.
ListBoxItem = Value 3.

You can read it into a ListBox controle like this:

private void btnLoad_Click(object sender, EventArgs e)
{
    IniFile file = new IniFile();
    file.Load("Sample.ini");
    IniSection listBoxSection = file.Sections["ListBoxItems"];
 
    this.listBox1.Items.Clear();
    this.listBox1.BeginUpdate();
 
    foreach (var key in listBoxSection.Keys)
        this.listBox1.Items.Add(key.Value);
 
    listBox1.EndUpdate();
}

Also you can write your ini content from the ListBox content like this:

private void btnSave_Click(object sender, EventArgs e)
{
    IniFile file = new IniFile();
    file.Load("Sample.ini");
    IniSection listBoxSection = file.Sections["ListBoxItems"];
 
    listBoxSection.Keys.Clear();
    foreach (var item in this.listBox1.Items)
        listBoxSection.Keys.Add("ListBoxItem", item.ToString());
 
    file.Save("Sample.ini");
}