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Editorial Team
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Asked: 2026-05-23T08:48:45+00:00

I’m getting the following in the program output when I run my application. When

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I’m getting the following in the program output when I run my application. When I search my application I can not find any time named "btnOpen."

I know these binding errors is because some bound-property is returning null to the tooltip.name. But, is this in my program, a referenced library, or something else? How do I track these down? I don’t know and can’t find btnOpen or btnPrint. My print buttons don’t even use tooltips.

System.Windows.Data Error: 5 : Value produced by BindingExpression is not valid for target property.; Value=” BindingExpression:Path=ToolTip; DataItem=’Button’ (Name=’btnOpen’); target element is ‘Button’ (Name=’btnOpen’); target property is ‘Name’ (type ‘String’)

System.Windows.Data Error: 5 : Value produced by BindingExpression is not valid for target property.; Value=” BindingExpression:Path=ToolTip; DataItem=’Button’ (Name=’btnPrint’); target element is ‘Button’ (Name=’btnPrint’); target property is ‘Name’ (type ‘String’)

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1 Answer

  1. Editorial Team

    If you don’t use Hungarian notation when naming your controls, that might be the first clue that btnOpen is not part of your project. Are you using any third-party controls? If so, open up the libraries in Reflector and see if you can find any references to btnOpen. That’s where I would go.

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