C# Threading Error

Question

Any other ways to do it in C# ? I've been working for it since yesterday but i cant solve this problem. . I want this code to be executed in the background using another thread so that my main thread or UI thread will be responsive, I am creating a dynamic label using loop. . Thanks.

private void Contact_Load(object sender, EventArgs e)
{
Thread loadContact = new Thread(new ThreadStart(loadContacts));
loadContact.Start();
}
private void loadContacts()
{
Label l = null; ContactPanel.Controls.Clear();
dt.Clear();
dataConnection.Open();
using (var messages = new SqlCommand("SELECT * FROM BasicInfo ", dataConnection))
{
da.SelectCommand = messages; da.Fill(dt);
SqlDataReader rd = messages.ExecuteReader();
string Fname, Lname,Fullname,Id;
if (rd.HasRows)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
Point location = Point.Empty;
DataRow dr = dt.Rows[i];
Id = dr["_Id"].ToString();
Fname = dr["_Fname"].ToString();
Lname = dr["_Lname"].ToString();
Fullname = Fname + Lname;
l = addLabel(i);
ContactPanel.Controls.Add(l);
l.Text = Fname + " " + Lname; l.Name = Lname + i;
l.Click += new EventHandler(this.labelClick);
}
}
else { }
Thread.Sleep(5000);
}
dataConnection.Close();
}
public void labelClick(object sender, EventArgs e)
{
Label currentLabel = (Label)sender;
currentLabel.BackColor = Color.Gray;
MessageBox.Show(currentLabel.Text);
MainForm MainForm = new MainForm();
MainForm.Show();
this.Close();
MainForm.TxtReciever.Text = currentLabel.Text;
}
public Label addLabel(int i)
{
Label l = new Label();
l.Name = "Date" + i.ToString();
l.BackColor = Color.SteelBlue;
l.ForeColor = Color.White;
//l.BackColor = Color.White;
l.Font = new Font("Segoe UI", 12, FontStyle.Regular);
l.TextAlign = ContentAlignment.MiddleCenter;
l.Margin = new Padding(5,3,3,3);
l.Width = 255;
l.Height = 53;
return l;
}