I use a Webservice, which retun a DataSet.
I use the code:
DataSet ds = (DataSet)wsHealth.GetSchools(Text1.Text);

But it result in an error in run time, the error message is
Unable to cast object of type 'System.Data.DataSet' to type 'DataSet'.
The namespaces I used are
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

Is there an namespace rather than System.Data which also contail DataSet?

You must have written some class called "DataSet" that is taking precedence.
Look at your own code and see what it contains. Maybe you could find it by
doing something like right-clicking on the DataSet name that is the return
type for GetSchools and select "Go To Definition".

"ad" <(E-Mail Removed)> wrote in message
news:%235NP1L%(E-Mail Removed)...
>I use a Webservice, which retun a DataSet.
> I use the code:
> DataSet ds = (DataSet)wsHealth.GetSchools(Text1.Text);
>
> But it result in an error in run time, the error message is
> Unable to cast object of type 'System.Data.DataSet' to type 'DataSet'.
> The namespaces I used are
> using System;
> using System.Data;
> using System.Configuration;
> using System.Web;
> using System.Web.Security;
> using System.Web.UI;
> using System.Web.UI.WebControls;
> using System.Web.UI.WebControls.WebParts;
> using System.Web.UI.HtmlControls;
>
> Is there an namespace rather than System.Data which also contail DataSet?
>

Thanks

I can't find any user defined Calss called "DataSet" in my solution.
When I right-clicking on the DataSet name that is the return
type for GetSchools and select "Go To Definition", it bring me to the
definition of DataSet in System.Data.




"Peter Rilling" <(E-Mail Removed)> ¼¶¼g©ó¶l¥ó·s»D:Ohq87%23%(E-Mail Removed)...
> You must have written some class called "DataSet" that is taking
> precedence. Look at your own code and see what it contains. Maybe you
> could find it by doing something like right-clicking on the DataSet name
> that is the return type for GetSchools and select "Go To Definition".
>
> "ad" <(E-Mail Removed)> wrote in message
> news:%235NP1L%(E-Mail Removed)...
>>I use a Webservice, which retun a DataSet.
>> I use the code:
>> DataSet ds = (DataSet)wsHealth.GetSchools(Text1.Text);
>>
>> But it result in an error in run time, the error message is
>> Unable to cast object of type 'System.Data.DataSet' to type 'DataSet'.
>> The namespaces I used are
>> using System;
>> using System.Data;
>> using System.Configuration;
>> using System.Web;
>> using System.Web.Security;
>> using System.Web.UI;
>> using System.Web.UI.WebControls;
>> using System.Web.UI.WebControls.WebParts;
>> using System.Web.UI.HtmlControls;
>>
>> Is there an namespace rather than System.Data which also contail DataSet?
>>
>
>