任何人都可以建议我为什么datetimepicker在数据检索中出错？

Question

string querySql = "Select Admission_Date,Name,Father_name,Date_of_birth,NIC_No,Present_Adress,Age,Contact_No,Weight,Height,Image from Admform WHERE Member_ID=@memid";

using (SqlConnection conSql = new SqlConnection("Data Source=azeem;Initial Catalog=ittihadgym;Integrated Security=True"))
{
   using (SqlCommand command = new SqlCommand(querySql, conSql))
   {
       conSql.Open();
       command.Parameters.AddWithValue("@memid", textBoxmember.Text);
       SqlDataReader reader = command.ExecuteReader();
       if (reader.Read())
       {
          dateTimePicker1.Value=reader[0].ToString();
          textBoxname.Text = reader[1].ToString();
          textBoxfname.Text = reader[2].ToString();
          dateTimePicker2.Value=reader[3].ToString();
          textBoxnic.Text = reader[4].ToString();
          textBoxadress.Text=reader[5].ToString();
          textBoxage.Text=reader[6].ToString();
          textBoxcntct.Text=reader[7].ToString();
          textBoxweight.Text=reader[8].ToString();
          textBoxheight.Text=reader[9].ToString();

          byte[] img = (byte[])(reader[10]); 
          if (img == null)
             pictureBox1.Image = null;
          else
          {
             MemoryStream ms = new MemoryStream(img);
             pictureBox1.Image = Image.FromStream(ms);
          }
       }
       else
       {
          MessageBox.Show("This is does not exist.");
           cn.Close();

Answer 1

应该是

dateTimePicker1.Value = Convert.ToDateTime(reader[0]);
dateTimePicker2.Value = Convert.ToDateTime(reader[3]);

因为DateTimePicker.Value属性设置或获取所选DateTime。因此，它需要DateTime而不是string。