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I am trying to create a RDLC report in WPF.

My .NET Framework version is .NET Core 3.1.

Can you help me with this?

While adding data source, I get an error

Error Screenshot

What I have tried:

I have tried to build with x86 but still not able to add data source with object as well as database, also one thing I noticed I am not able to see list of class from same WPF project, so tried with other class library project it is working fine but getting error as below.
Updated 7-Jan-22 3:04am
Richard MacCutchan 7-Jan-22 7:41am
You have a null reference in your code somewhere.
Viken Patel 7-Jan-22 21:25pm
@Richard can you check error screen shot ?

1 solution

That error means you're trying to call a method or get/set a property on a object that is null, meaning that object doesn't exist.

You haven't shown the code that's throwing the error, so this is about the most you're going to get for an answer. You have to use the debugger and follow your code backwards from the point of the error to find out why the variable you're trying to use is null.
Viken Patel 7-Jan-22 21:26pm
@Dave can you check error screenshot ? it is while i am adding new data source
Dave Kreskowiak 7-Jan-22 21:29pm
I don't use the designers for data work, ever. I hand-code all database work every single time. This keeps VS from hiding the real work from me and I have much better control over what the code is doing.

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