分配数据源c＃后没有列表框项目

Question

I've been trying for a while to populate a listbox with a datatable.

Here is my code as suggested by almost every page I've seen:

ListBox lb = new ListBox();

using (SqlCommand cmd = new SqlCommand("SELECT * FROM Files", con))
{
    SqlDataAdapter dap = new SqlDataAdapter(cmd);
    DataTable tblShapes = new DataTable();
    dap.Fill(tblShapes);

    lb.DataSource = tblShapes;

    // define Display and Value members
    lb.DisplayMember = "Name";
    lb.ValueMember = "Id";
}

The problem is that there is no items in lb.Items even though lb.datasource.rows has my records I also tried to change the order of assigning datasource with DisplayMember and ValueMember nothing changes

c# winforms

Thanks in advance

Answer 1

Since you are dynamically creating lsitbox you need to add to a control, also set the DataSource later

ListBox lb = new ListBox();
this.Controls.Add(lb);
lb.DisplayMember = "Name";
lb.ValueMember = "Id";
lb.DataSource = tblShapes;