Question

im working in WinForms C#.

for some reason when I want to populate my listBox it stops and says my database is corrupt.
I have added a repair line and the codes run afterwards, but nothing happends. My listbox is not populated.

Here is the code im using.:

public void button1_Click(object sender, EventArgs e)
    {
        SqlCeConnection cn = new SqlCeConnection(@"Data Source = Database1.mdf");
        cn.Open();
        SqlCeCommand cm = new SqlCeCommand("SELECT * FROM tblprojects ORDER BY Projekt_liste ASC", cn);

        try
        {
            SqlCeDataReader dr = cm.ExecuteReader();

            while (dr.Read())
            {
                ListBox project_list = Application.OpenForms["Form1"].Controls["tabControl1"].Controls["tabPage1"].Controls["Project_list"] as ListBox;
                project_list.Items.Add(dr["Projekt_liste"].ToString());
            }
            cn.Close();
            cn.Dispose();
        }
        catch (Exception ex)
        {
        }
    }

    public void button2_Click(object sender, EventArgs e)
    {

        SqlCeConnection cn = new SqlCeConnection();

        SqlCeEngine engine = new SqlCeEngine("Data Source = Database1.mdf");

        if (false == engine.Verify())
        {
            MessageBox.Show("Database is corrupted.");
            engine.Repair(null, RepairOption.RecoverAllPossibleRows);
        }
    }

Answer 1

For example if you want to load the items

1. make sure you have a ListBox on the winform
2. name the ListBox 
3. Create a ListItem 
4 Add the ListItem to the ListBox

while(dr.Read())
{
  ListViewItem obj=new ListViewItem(Convert.ToString(dr[0]),Convert.ToString(dr[1]);
  //in object of ListViewItem give display member at first and give value member at second position 
  listView1.Items.Add(obj); // add object to the listbox
}

Here are a few links that you can use as well to show different ways on how to populate a ListBox

one is Windows and the other will be if you are using or plan to use ASP.NET

Populate a ListBox when using SQLDataReader

asp.net SqlDataReader example: how to use Read() method to populate ListBox

Populate ASP.NET ListBox using SqlDataReader