Creating a custom attribute

suggest change
//1) All attributes should be inherited from System.Attribute
//2) You can customize your attribute usage (e.g. place restrictions) by using System.AttributeUsage Attribute
//3) You can use this attribute only via reflection in the way it is supposed to be used
//4) MethodMetadataAttribute is just a name. You can use it without "Attribute" postfix - e.g. [MethodMetadata("This text could be retrieved via reflection")].
//5) You can overload an attribute constructors
[System.AttributeUsage(System.AttributeTargets.Method | System.AttributeTargets.Class)]
public class MethodMetadataAttribute : System.Attribute
{
    //this is custom field given just for an example
    //you can create attribute without any fields
    //even an empty attribute can be used - as marker
    public string Text { get; set; }

    //this constructor could be used as [MethodMetadata]
    public MethodMetadataAttribute ()
    {
    }

    //This constructor could be used as [MethodMetadata("String")]
    public MethodMetadataAttribute (string text)
    {
        Text = text;
    }
}

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