private void button2_Click(object sender, EventArgs e) { try { this.textBox1.Clear(); var connection_str = System.Configuration.ConfigurationManager.ConnectionStrings["DEMO_UD"]; string s = connection_str.ConnectionString; U2Connection con = new U2Connection(); con.ConnectionString = s; con.Open(); this.textBox1.AppendText("Connected.........................(UniData Account)" + Environment.NewLine); U2Command cmd = con.CreateCommand(); cmd.CommandText = "SELECT ID, FNAME,LNAME FROM STUDENT_NF_SUB"; DataSet ds = new DataSet(); m_da = new U2DataAdapter(cmd); m_da.Fill(ds); m_U2CommandBuilder = new U2CommandBuilder(m_da); this.dataGridView1.DataSource = ds.Tables[0].DefaultView; this.textBox1.AppendText("Done........................." + Environment.NewLine); } catch (Exception e3) { this.textBox1.AppendText(e3.Message); MessageBox.Show(e3.Message); } }