public void ListPosts() { dataGridView1.Columns[0].Visible = true; dataGridView1.Columns[1].Visible = true; dataGridView1.Columns[2].Visible = true; dataGridView1.Columns[3].Visible = false; dataGridView1.Columns[4].Visible = false; dataGridView1.Columns[5].Visible = false; dataGridView1.Columns[6].Visible = false; var List = Con.Query("SELECT post_author, post_title, post_content,post_name FROM wp_posts"); dataGridView1.RowCount = List.Length; for (int i = 0; i < List.Length; i++) { var List1 = Con.Query("SELECT user_nicename FROM wp_users WHERE ID=" + List[i].ItemArray[0]); try { dataGridView1[0, i].Value = List1[0].ItemArray[0].ToString(); dataGridView1[1, i].Value = List[i].ItemArray[1]; dataGridView1[2, i].Value = List[i].ItemArray[2]; } catch { } } }