Display base64 img on Razor page

public string imagedata { get; set; } = "";
        public void OnPostGetSelectedImage()
        {
            string myBase64 = "examplebase64";

            imagedata = string.Format($"data:image/png;base64", myBase64);
        }

<div class="container">
    <div class="form-group">
    <img id="UserImage" src="@Model.imagedata" alt="your image" />
</div>