c#-SQLITE和dataGridView1

我搜索，我搜索，我买，我找不到解决方案 这是我的密码

private void pointage_Load(object sender, EventArgs e)
        {
            sql = "SELECT firstname, lastname FROM company";
            command = new SQLiteCommand(sql, connectiondb);
            DataSet1 mydata = new DataSet1();
            SQLiteDataAdapter zz = new SQLiteDataAdapter(sql, connectiondb);
            zz.Fill(mydata.Tables["DataTable1"]);

            int i;
            SQLiteDataReader reader = command.ExecuteReader();
            DataGridViewRow row = (DataGridViewRow)dataGridView1.Rows[1].Clone();
            while (reader.Read())
            {
                    for (i = 0; i <= System.Convert.ToUInt32(reader["id"]); i++)
                    {
                        row = this.dataGridView1.Rows[i];
                        row.Cells["Column10"].Value = reader["firstname"].ToString();
                        row.Cells["Column9"].Value = reader["lastname"].ToString();
                    }
            }

        }

 for (i = 0; i <= System.Convert.ToUInt32(reader["id"]); i++)
                         {
                             row = this.dataGridView1.Rows[i];
                             row.Cells["Column10"].Value = reader["firstname"].ToString();
                             row.Cells["Column9"].Value = reader["lastname"].ToString();
                         }

我把它放在

MessageBox.Show(reader["firstname"].ToString());

 for (i = 0; i <= System.Convert.ToUInt32(reader["id"]); i++)
                         {
                             row = this.dataGridView1.Rows[i];
                             row.Cells["Column10"].Value = reader["firstname"].ToString();
                             row.Cells["Column9"].Value = reader["lastname"].ToString();
                         }

那会有用的，但当我这么做的时候

 for (i = 0; i <= System.Convert.ToUInt32(reader["id"]); i++)
                         {
                             row = this.dataGridView1.Rows[i];
                             row.Cells["Column10"].Value = reader["firstname"].ToString();
                             row.Cells["Column9"].Value = reader["lastname"].ToString();
                         }

---

for（i=0；iok伙计们，最后我找到了解决方案：D

 for (i = 0; i <= System.Convert.ToUInt32(reader["id"]); i++)
                         {
                             row = this.dataGridView1.Rows[i];
                             row.Cells["Column10"].Value = reader["firstname"].ToString();
                             row.Cells["Column9"].Value = reader["lastname"].ToString();
                         }

    while (reader.Read())
    {
        i = System.Convert.ToInt32(reader["id"].ToString());
        dataGridView1.Rows.Add();

        MessageBox.Show(System.Convert.ToString(i));
        DataGridViewRow R = dataGridView1.Rows[i-1];

        R.Cells["Column9"].Value = reader["firstname"].ToString();
        R.Cells["Column10"].Value = reader["lastname"].ToString();

    }

你能详细说明一下“那不起作用”吗？你有例外吗？你想用
for
循环来完成什么？