Request model throws stack overflow – .NET

I have the model NewOrderModel: public class NewOrderModel { private readonly List<KeyValuePair<string, string>> symbols = new List<KeyValuePair<string, string>> { new KeyValuePair<string, string> (“WINZ19”, “XBMF”), new KeyValuePair<string, string> (“WDOZ19”, “XBMF”) }; [Required] public string symbol { get => symbol; set { market = this.symbols.Find(findSymbol => findSymbol.Key == symbol).Value; symbol = value; } } public string market…

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