How Many Rows Can A Listbox Hold? Windows Form Application

Question

I have over 9,00,000 records in my Access database but only a fraction of that is being displayed in the listbox. How Many Rows Can A Listbox Hold? Around 65K is the answer I go

Answer 1

I've found it preferable to use DataGridView over ListBox in winforms. The key is to use VirtualMode. I'd derive from DataGridView similar to:

class CustomDgv : DataGridView {
    public CustomDgv() {
        this.BackgroundColor = SystemColors.Window;
        this.BorderStyle = BorderStyle.None;
        this.Dock = DockStyle.Fill;
        this.MultiSelect = false;
        this.AutoGenerateColumns = false;
        this.RowHeadersVisible = this.AllowUserToResizeRows = false;

        this.ReadOnly = true;
        this.AllowUserToAddRows = this.AllowUserToDeleteRows = false;
        this.CellBorderStyle = DataGridViewCellBorderStyle.None;

        this.VirtualMode = true;
        this.SelectionMode = DataGridViewSelectionMode.FullRowSelect;

        this.RowTemplate.Height = this.FontHeight + this.FontHeight / 2;
    }
}

and then implement the virtual part accordingly.