Fill Data in Combobox using C#

public void FillCategoryCombo()
{
    try
    {
        con.Open();
        cmd.CommandText = "select * from tblCategory";
        cmd.Connection = con;
        SqlDataReader dr = cmd.ExecuteReader();
        while (dr.Read())
        {

           //  catid = Convert.ToInt32(dr["CatID"].ToString());
            cmbFoodCategory.Items.Add(dr["CatName"]);
        }
        con.Close();
        dr.Close();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}