Winform-based database connection and display query results using DataGridView

 //查询全部

    
     private void btnQuery_Click(object sender, EventArgs e)
    
     {
    
  string sql = "select  * from SeQu ";
    
 SqlCeDataReader objReader = SQLHelper.GetReader(sql);
    
         List<SeQuDate> list = new List<SeQuDate>();
    
         while (objReader.Read())
    
         {
    
             list.Add(new SeQuDate()
    
             {
    
                 SqId = objReader["sqid"].ToString(),
    
                 SqName = objRead