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"object reference not set to an instance of an object" error message - C# app

69 New Member
Hello all,

I'm hoping somebody can help me with this.

I have an app that I've been developing in MS Visual Studio 2005 Pro, C#. I have connectivity to a SQL server database. All of the sudden, whenever I try to add a new or change an existing data binding to a text box (as an example), it gives me the error, "object reference not set to an instance of an object".

To clarify... this error occurs when I click on the "text" or "tag" field in the data bindings properties... so I don't even get a chance to try to change it because the error pops up as soon as I click on the property.

My app still compiles and runs fine as is... I just can't change the data binding for any controls, or add any new data bindings. Does anyone know what the heck is going on?

Also... I've already done a "clean" and a recompile on the project and that didn't help. I also installed service pack 2 hoping it would help, but to no avail.

Any help will be greatly appreciated.
Jan 3 '08
11 7490
7,872 Recognized Expert Expert
I don't know if anyone is still following this thread, but just in case, I wanted to post my solution. The problem was that my project file still contained a reference to a datasource (class) I had created and deleted. When I deleted the class after deciding not to use it, it didn't occur to me to go to the project file and delete the reference.
That solution was mentioned as a possibility above.
Mar 7 '08 #11
1 New Member
Hello, I'm having the same issue when I click on the bindings text property and I am getting this error on every form in the project.
I have opened up my databindings folder and walked through all datasources and all have an object in the project. Is there something else I need to do? Is there a utility that does some kind of cleanup? I have too many datasources and forms to recreate them. Thanks for any help you can give.
Feb 12 '09 #12

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