Page_Load
datagrid1.datas ource=dataset1
//I am filling the datagrid and it works fine when page is displayed
end
---------------
button 1_click
dim ds as dataset
ds=datagrid1.da tasource
//gives error
end
when I try to get the datasource from a datagrid (i.e. a dataset) it gives
error
"Object reference not set to an instance of an object."
is it due to postback event the datagrid's datasource is not accessible ??
vips
6  1963 
try casting
Not sure of the the VB code but in C#
DataSet ds = new DataSet();
ds = (dataset)datagr id1.datasource;
"vips" <yp**@hotmail.c om> wrote in message
news:OZ******** ******@TK2MSFTN GP14.phx.gbl... Page_Load
datagrid1.datas ource=dataset1
//I am filling the datagrid and it works fine when page is displayed
end
---------------
button 1_click
dim ds as dataset
ds=datagrid1.da tasource
//gives error
end
when I try to get the datasource from a datagrid (i.e. a dataset) it gives
error
"Object reference not set to an instance of an object."
is it due to postback event the datagrid's datasource is not accessible ??
vips
That's right. The datasource isn't maintained in viewstate as a raw
dataset..instea d only the information necessary to the datagrid (rows,
columns, ...) are maintained. If you need the dataset again you'll need
to either recreate it or store it somewhere...
KArl
--
MY ASP.Net tutorials http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying) http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"vips" <yp**@hotmail.c om> wrote in message
news:OZ******** ******@TK2MSFTN GP14.phx.gbl... Page_Load
datagrid1.datas ource=dataset1
//I am filling the datagrid and it works fine when page is displayed
end
---------------
button 1_click
dim ds as dataset
ds=datagrid1.da tasource
//gives error
end
when I try to get the datasource from a datagrid (i.e. a dataset) it gives
error
"Object reference not set to an instance of an object."
is it due to postback event the datagrid's datasource is not accessible ??
vips
it'd be ctype(DataGrid1 .DataSource, DataSet) but if that was the error I
wouldn't expect him to get a nullreference error...instead I'd expect him to
get an invalid cast...
Karl
--
MY ASP.Net tutorials http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying) http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"Grant Merwitz" <gr***@workshar e.com> wrote in message
news:uO******** ******@TK2MSFTN GP09.phx.gbl... try casting
Not sure of the the VB code but in C#
DataSet ds = new DataSet();
ds = (dataset)datagr id1.datasource;
"vips" <yp**@hotmail.c om> wrote in message
news:OZ******** ******@TK2MSFTN GP14.phx.gbl... Page_Load
datagrid1.datas ource=dataset1
//I am filling the datagrid and it works fine when page is displayed
end
---------------
button 1_click
dim ds as dataset
ds=datagrid1.da tasource
//gives error
end
when I try to get the datasource from a datagrid (i.e. a dataset) it
gives
error
"Object reference not set to an instance of an object."
is it due to postback event the datagrid's datasource is not accessible
??
vips
I am getting datagrid.dataso urce as nothing !!
"Grant Merwitz" <gr***@workshar e.com> wrote in message
news:uO******** ******@TK2MSFTN GP09.phx.gbl... try casting
Not sure of the the VB code but in C#
DataSet ds = new DataSet();
ds = (dataset)datagr id1.datasource;
"vips" <yp**@hotmail.c om> wrote in message
news:OZ******** ******@TK2MSFTN GP14.phx.gbl... Page_Load
datagrid1.datas ource=dataset1
//I am filling the datagrid and it works fine when page is displayed
end
---------------
button 1_click
dim ds as dataset
ds=datagrid1.da tasource
//gives error
end
when I try to get the datasource from a datagrid (i.e. a dataset) it
gives error
"Object reference not set to an instance of an object."
is it due to postback event the datagrid's datasource is not accessible
??
vips
u mean I need to keep the dataset it in viewstate ??
but the framework itself keeps it in viewstate ...cant i access it some how
??
"Karl Seguin" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net>
wrote in message news:u1******** ********@TK2MSF TNGP14.phx.gbl. .. That's right. The datasource isn't maintained in viewstate as a raw
dataset..instea d only the information necessary to the datagrid (rows,
columns, ...) are maintained. If you need the dataset again you'll need
to either recreate it or store it somewhere...
KArl
--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"vips" <yp**@hotmail.c om> wrote in message
news:OZ******** ******@TK2MSFTN GP14.phx.gbl... Page_Load
datagrid1.datas ource=dataset1
//I am filling the datagrid and it works fine when page is displayed
end
---------------
button 1_click
dim ds as dataset
ds=datagrid1.da tasource
//gives error
end
when I try to get the datasource from a datagrid (i.e. a dataset) it
gives error
"Object reference not set to an instance of an object."
is it due to postback event the datagrid's datasource is not accessible
??
vips
I mean, you can keep it wherever you want...viewstat e, session,
cache..whatever appropriate for your situation (don't know enough to tell
you).
The framework doesn't keep the dataset in the viewstate. It keeps the
controls which make up the datagrid (which were build using the dataset) but
not the dataset itself...
Karl
--
MY ASP.Net tutorials http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying) http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"vips" <yp**@hotmail.c om> wrote in message
news:OG******** ******@TK2MSFTN GP09.phx.gbl...
u mean I need to keep the dataset it in viewstate ??
but the framework itself keeps it in viewstate ...cant i access it some
how
??
"Karl Seguin" <karl REMOVE @ REMOVE openmymind REMOVEMETOO . ANDME net>
wrote in message news:u1******** ********@TK2MSF TNGP14.phx.gbl. .. That's right. The datasource isn't maintained in viewstate as a raw
dataset..instea d only the information necessary to the datagrid (rows,
columns, ...) are maintained. If you need the dataset again you'll
need
to either recreate it or store it somewhere...
KArl
--
MY ASP.Net tutorials
http://www.openmymind.net/ - New and Improved (yes, the popup is
annoying)
http://www.openmymind.net/faq.aspx - unofficial newsgroup FAQ (more to
come!)
"vips" <yp**@hotmail.c om> wrote in message
news:OZ******** ******@TK2MSFTN GP14.phx.gbl... > Page_Load
>
> datagrid1.datas ource=dataset1
>
> //I am filling the datagrid and it works fine when page is displayed
>
> end
>
> ---------------
>
> button 1_click
>
> dim ds as dataset
>
> ds=datagrid1.da tasource
>
> //gives error
>
> end
>
>
>
> when I try to get the datasource from a datagrid (i.e. a dataset) it gives > error
>
> "Object reference not set to an instance of an object."
>
> is it due to postback event the datagrid's datasource is not accessible ?? >
>
>
> vips
>
>
>
>
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