各位帮我看看，为什么运行后，DataGridView1 不显示数据啊？

 
private void Form1_Load(object sender, EventArgs e)
        {
            string sqlstr;

            try
            {
                //Initialize SqlConnection string.
                SqlConnection conn = new SqlConnection("server=.;uid=sa;password=sa;database=vis");

                sqlstr = "select * from company";

                conn.Open();
                SqlDataAdapter myDataAdapter = new SqlDataAdapter(sqlstr, conn);
               

                DataSet dataset = new DataSet();

                dataGridView1.DataSource = dataset;


                myDataAdapter.Fill(dataset);
              //MessageBox.Show("Dispaly data seccuss.", "提示");
                
            }
            catch {
                MessageBox.Show("Dispaly data error.","提示");
            }
           

        }