按日期搜索Gridview，但日历控件选择器（即DateTime）同时包含日期和时间，例如：2013-01-01 00：00：00.000

Question

I have a GridView that should be populated according to a selected date, so I made the use of the Calendar control .

The problem

• Since the Calendar control's selected date is DateTime, unfortunately the selected date in the Calendar seems to be is in the format : dd-MM-yyy
  example 2013-02-15
• while the date field in the Database is of type datetime meaning : dd-MM-yyyy HH:mm:SS.ms
  example 2013-02-15 09:02:03.253

So there will be no result since the Calendar control and the Database field are of different types.

What i tried

SqlDataSource1.SelectCommand = "Select * from table1 where start_date Like '% " & calendar1.SelectedDate.Date & " %' "

As you can see i worked the sqldatasource in code behind and i made the use of Like But even with the use of Like no results show due to Database having not only date but time too .

I was also thinking to change the sql query itself, and precisely the field start_date , to omit the time (HH:mm:SS.ms) but is it possible to do so?

Edit:

Even if the Calendar Control's selected date and the field in the database are both DateTime, the search won't work because when searching with the Calendar Control its query will be Date and Time example 2013-01-01 00:00:00.000 while in the DB the time is not always 00:00:00 thus the need of Between as the answer below.

Answer 1

Calendar.SelectedDate is DateTime . So just change calendar1.SelectedDate.Date to calendar1.SelectedDate .

Proof: http://msdn.microsoft.com/ru-ru/library/system.web.ui.webcontrols.calendar.selecteddate.aspx

Answer 2

You can use a Date to extract records from a database using a DateTime field. I dont think using LIKE on dates is a good idea. Specify From and To date ranges to get one day worth of data:

SqlDataSource1.SelectCommand = "Select * from table1 where start_date >" & calendar1.SelectedDate.Date & " AND start_date < " & calendar1.SelectedDate.Date.AddDays(1)

Or using the BETWEEN operator:

SqlDataSource1.SelectCommand = "Select * from table1 where start_date between " & calendar1.SelectedDate.Date & " AND " & calendar1.SelectedDate.Date.AddDays(1)

Answer 3

Formatting only matters when you are displaying data. Basically, dates are integers and datetimes are floats.

Create a .net DateTime object from whatever is selected in your datepicker. Then convert it to a query parameter which you use in your query.