My application force close when select picture from gallery

I got problem when I choose picture with size 500 Kb from my gallery and my application force close. But if i choose picture with size 100-250kb it is success load image and send base64 to my database. Could you help me how to fix it ?

It is message error when i choose picture with 500kb:

   Refit.ApiException: 'Response status code does not indicate success: 500 (Internal Server Error).'

This is my coding from mobile app:

async void SavePicture(object sender, EventArgs e)
 {
        file = await CrossMedia.Current.PickPhotoAsync(new PickMediaOptions
        {
            PhotoSize = PhotoSize.Small
            //CompressionQuality = 100,

        });

        if (file == null)
            return;


        //Convert image to string
        FileStream fs = new FileStream(file.Path, FileMode.Open, FileAccess.Read);
        byte[] ImageData = new byte[fs.Length];
        fs.Read(ImageData, 0, System.Convert.ToInt32(fs.Length));
        fs.Close();
        string imgResized = Convert.ToBase64String(ImageData);

        imageResize.Source = file.Path;

        api = RestService.For<ApiInterface> 
        ("http://192.168.0.190/webservice/webservice.asmx");

        String idgoogle = "";

        var id = Application.Current.Properties["Id"].ToString();

        var stringimage = imgResized;


        User user = new User(idgoogle);
        user.Profile_Image = stringimage;
        user.Id = id;


        var responseupdate = await api.UpdateGoogle(new UpdateGoogleQuery(user));

        if (responseupdate.isSuccess)
        {
            Loading.toast("Sukses Menyimpan Foto");
        }
        else
        {
            LoadingFailed.toast("Gagal Menyimpan Foto");
        }

}

This is my coding from webservice

public void update(User dtGoogle)
{
        String sql = $"UPDATE google SET profile_image = ('{dtGoogle.Profile_Image}') WHERE id = ('{dtGoogle.Id}')";
        Connection.executeSql(sql);
}