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Editorial Team
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Asked: 2026-06-14T22:40:37+00:00

I use Visual Studio 2012, and wrote some XAML(of WPF) code, just like this:

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I use Visual Studio 2012, and wrote some XAML(of WPF) code, just like this:

<StackPanel>
    <Label Target="txt">UserName:</Label>
    <TextBox Name="txt"></TextBox>
</StackPanel>

then, the compilation failed. It said to Label related-code,

Value cannot be null. Parameter name: context.

I don’t know its meaning. Did I miss anything?

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1 Answer

  1. Editorial Team

    It is a designer-only error. Code should compile without any issue.

    EDIT: This exception is due to Silverlight not supporting this syntax : Target="txt". this syntax is only supported by WPF. It’s a known bug in the designer, even if your project is a WPF project, and was caused by MS wanting to support design-time checks for Silverlight.

    If you don’t want the exception you have to use the full binding syntax (supported by WPF and Silverlight)

    <Label Target="{Binding ElementName=txt}">UserName:</Label>
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