net481 
namespace Microsoft.AspNet.Mvc.ModelBinding
{
    [DebuggerDisplay("{DebuggerToString(),nq}")]
    public abstract class ModelMetadata
    {
        public abstract bool IsRequired { get; }
    }
}
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.NET Framework
4.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

Microsoft.AspNet.Mvc.Abstractions , Version=6.0.0.0, PublicKeyToken=adb9793829ddae60

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Package Microsoft.AspNet.Mvc.Abstractions (6.0.0-rc1-final) net451
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