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C# error "specified cast is not valid"

Posted on 2004-03-30
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Last Modified: 2012-05-04
Hello Expert, I am getting an error when i try to do this
aDataSet = (DataSet) dataGrid1.DataSource;
Do you know why i would get specified cast is not valid i got it from
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwindowsformsdatagridclassdatasourcetopic.asp so i am not sure why it would not work. Can you help me?
Thanks
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Question by:jvoros1
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3 Comments
 
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Accepted Solution

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dfiala13 earned 2000 total points
ID: 10714924
Make sure the DataSource on the grid is not null.  If you are trying to make this call after a postback, the DataSource property will be null and you will not be able to cast.

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Expert Comment

by:Callandor
ID: 10714942
The example shows
DataSet* myDataSet;
myDataSet = dynamic_cast<DataSet*> (dataGrid1->DataSource);

You want to cast a pointer to an object, not cast the actual object.
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Author Comment

by:jvoros1
ID: 10714968
Thanks for you help I see my problem now my dataGrid.DataSource = aDataTable not a aDataSet
so i changed it to aDataTable = (DataTable) dataGrid1.DataSource;
And it works great :)
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