Date Picker Help

Question

I am attempting to replicate the below date picker example, however I continue to recieve the same errors.  N

http://help.arcgis.com/en/webapi/silverlight/apiref/api_start.htm

However I continue to have issues with the following lines of code:
  _myTimeExtent.Start = StartDate.SelectedDate;
  _myTimeExtent.End = EndDate.SelectedDate;

The error reads: 
Cannot implicitly convert type 'System.DateTime?' to System.DateTime'.

Not sure if this is the bext example to work with when trying to implement a datepicker to query a layer, but this is the only I could find. Has anyone had success implementing this example or can someone share how to implement a date query using a datepicker.

gabrielvazquez · Answer

Was able to get the query working using a date picker, by applying the following code to the query task.

DateTime fromdate=Convert.ToDateTime(FromDate.SelectedDate);
DateTime todate =Convert.ToDateTime(ToDate.SelectedDate);

query.TimeExtent=new ESRI.ArcGIS.Client.TimeExtent(new DateTime(1970, 1, 4, 0, 0, 0), new DateTime(1971, 4, 12, 0, 0, 0));

query.TimeExtent=new ESRI.ArcGIS.Client.TimeExtent(fromdate,todate);

gabrielvazquez · Answer

I went back and tried to create a  single date query using a datepicker, and it doesnt seem to be working. So I thought I would check the ArcGIS Server Layer the query is using.

I can query the layer through the services directory/ rest/services, however  I have to query the layer using the following format  "111559680000" to recieve a result. I've also found a few older threads linked to this.

http://forums.arcgis.com/threads/20426-Did-the-date-format-change-for-Query-REST-Post-JSON-responses-at-ags-10?highlight=query+date+field+rest

http://forums.arcgis.com/threads/16644-Date-Conversion-Problems-REST-lt-gt-Silverlight?highlight=Silverlight+time+conversion

I can also obtain a result through the rest services using the where query -  example: "IncidentDate" = '2008-08-31 00:00:00'

I am guessing I have to do some conversion, similar to below. However if anyone has any additional examples it would help. Thanks.

http://msdn.microsoft.com/en-us/library/cc165448.aspx

gabrielvazquez · Answer

J, 
Thank you for info and the links. I will defenitely try the silverlight examples and the code you provided. The API I was trying link was for the DatePickerStyle Property. If you type that it in the API search, you should find easily. Thanks again for the info.