CODEWITHSUNDEEP
asp.netviewstate
IFrizy
IFrizy

Reputation: 1745

ViewState equal null asp.net

I have the next code.

protected void Page_PreRender(object sender, EventArgs e)
{ 
  bool isDelayWarning = proxy.MerchantPaySystemSetting_IsHoldPaymentsAllow(clientID, PaySystem.Type));
  ViewState.Add("IsDelayWarning", isDelayWarning);
}

protected void btnSend_Click(object sender, EventArgs e)
{
  if ((bool)ViewState["IsDelayWarning"] && !cbxDelayConfirm.Checked)
  {
    this.CustomErrorMessage = Yandex_Term_Error;
    return;
  }
}

In btnSend_Click method ViewState["IsDelayWarning"] = null.

How can I resolve this trouble?

Thanks! :)

Upvotes: 0

Views: 273

Answers (2)

AyoFafore
AyoFafore

Reputation: 31

You can always check for null reference by doing something like this 

if (something != null)
code ------

or another way if you will sometimes have null is to use. For example if user address is null

if (thisuser.Address == null)
{
 thisuser.Address = new Address();
}
thisuser.Address = user.Address.City;

Upvotes: 0

Blindy
Blindy

Reputation: 67382

I'm not sure about the logic you're going for, but a button push happens during post-back, before the page is rendered. Put breakpoints in your two methods to see their relative order.

You can see a diagram here

Pay attention to the yellow marked items, control event processing is one of them and it happens strictly before PreRender.

Upvotes: 1

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