I have a project that I've been working on for a while, where several
forms use DataGridViews to represent database information. The forms
are .NET 2.0, in Studio 2005. For the past couple of days, whenever I
click the little arrow in the top-right corner to show the
DataGridView Tasks subwindow, then click to expand the dropdown for
"Choose Data Source...", Studio crashes. If I "Debug" the app, of
course I don't have any symbol tables, so I can't do much, but I do
see that it's because of an unhandled null pointer exception. I can
only assume this is being generated because Studio is trying to
enumerate all the available project data sources, and coming up with a
null pointer somewhere. Also, if I just select the item, then go to
"DataSource " under Properties, and try to expand that combo box, I get
an error "Object reference not set to an instance of an object" -- the
boilerplate null pointer exception. In that case, Studio does *not*
crash. Obviously, it's still a big impediment.
This happens on existing, older forms, which I designed months ago,
when the Data Source enumerator was obviously not broken. Using the
Data --Show Data Sources menu option works fine -- it lists all the
DataSets that I've defined.
I'm really at a loss how to proceed -- the project is managed by
SourceSafe, so I could roll back to previous versions, but it's been
under heavy development, and I don't know what versions of Form A
correspond to what version of Form B, nor which versions of Forms A
and B correspond to which version of the project file. It worked a
month or two ago, the last time I tried to add a DataGridView, and it
didn't work starting at least a week ago -- that's all the information
I have to go on. If I could fix the problem *without* rolling back,
I'd be happiest... maybe there's some kind of cache I can clear or
something? I'm really not familiar enough with the underpinnings of
devenv to fix it all alone.
forms use DataGridViews to represent database information. The forms
are .NET 2.0, in Studio 2005. For the past couple of days, whenever I
click the little arrow in the top-right corner to show the
DataGridView Tasks subwindow, then click to expand the dropdown for
"Choose Data Source...", Studio crashes. If I "Debug" the app, of
course I don't have any symbol tables, so I can't do much, but I do
see that it's because of an unhandled null pointer exception. I can
only assume this is being generated because Studio is trying to
enumerate all the available project data sources, and coming up with a
null pointer somewhere. Also, if I just select the item, then go to
"DataSource " under Properties, and try to expand that combo box, I get
an error "Object reference not set to an instance of an object" -- the
boilerplate null pointer exception. In that case, Studio does *not*
crash. Obviously, it's still a big impediment.
This happens on existing, older forms, which I designed months ago,
when the Data Source enumerator was obviously not broken. Using the
Data --Show Data Sources menu option works fine -- it lists all the
DataSets that I've defined.
I'm really at a loss how to proceed -- the project is managed by
SourceSafe, so I could roll back to previous versions, but it's been
under heavy development, and I don't know what versions of Form A
correspond to what version of Form B, nor which versions of Forms A
and B correspond to which version of the project file. It worked a
month or two ago, the last time I tried to add a DataGridView, and it
didn't work starting at least a week ago -- that's all the information
I have to go on. If I could fix the problem *without* rolling back,
I'd be happiest... maybe there's some kind of cache I can clear or
something? I'm really not familiar enough with the underpinnings of
devenv to fix it all alone.
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