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Showing content from https://docs.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca2259 below:

CA2259: Ensure 'ThreadStatic' is only used with static fields - .NET

CA2259: Ensure ThreadStatic is only used with static fields

In this article Property Value Rule ID CA2259 Title Ensure ThreadStatic is only used with static fields Category Usage Fix is breaking or non-breaking Non-breaking Enabled by default in .NET 9 As warning Cause

The ThreadStaticAttribute attribute is applied to an instance field.

Rule description

ThreadStaticAttribute, which indicates that the value of a field is unique for each thread, only affects static (Shared in Visual Basic) fields. When applied to instance fields, the attribute has no impact on behavior.

How to fix a violation

To fix a violation, remove the ThreadStaticAttribute attribute from the field.

Example

The following code snippet shows a violation of CA2259:

class C
{
    [ThreadStatic]
    public int number = 404;
}

Class C
    <ThreadStatic>
    Public number As Integer = 404
End Class

When to suppress warnings

It's safe to suppress a warning from this rule. However, the [ThreadStatic] attribute is a nop and isn't doing what you intended it to do.