❔ Razor Pages Session for revalidating Page Model

TryValidateModel(this);"

Microsoft.AspNetCore.Http.DefaultHttpContext.get_Session()
Microsoft.Extensions.Internal.PropertyHelper.CallNullSafePropertyGetter<TDeclaringType, TValue>(Func<TDeclaringType, TValue> getter, object target)
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationEntry.get_Model()
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitChildren(IValidationStrategy strategy)
Microsoft.AspNetCore.Mvc.ModelBinding.Validation.ValidationVisitor.VisitComplexType(IValidationStrategy defaultStrategy)

public async Task<IActionResult> OnPostAsync()
{
    if (!ModelState.IsValid)
    {
        for (int x = ThirdPartyInformations.Count -1; x >= 0; x--) 
        {
            if (ThirdPartyInformations[x].HiddenEntry == true)
            {
                ThirdPartyInformations.RemoveAt(x);
            }
        }

        ModelState.Clear();
        TryValidateModel(this); // <-- 
    }

    if (!ModelState.IsValid ||
    ....