object refrence not set to instance of object Viewstate

Question

2.00/5 (1 vote)

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C#

protected void btnReq_Click(object sender, EventArgs e)
  {
      ViewState["lbl"] = "text Labal";

  }
  protected void btnRespo_Click(object sender, EventArgs e)
  {

          lblText.Text = ViewState["lbl"].ToString();

  }

Posted 16-Mar-15 6:42am

Rajnish D mishra

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CHill60 16-Mar-15 12:45pm

In which line is the problem and under what circumstances does it happen?

Rajnish D mishra 16-Mar-15 12:46pm

lblText.Text = ViewState["lbl"].ToString();
there error show when i click on button btnRespo

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Kornfeld Eliyahu Peter · Accepted Answer · 2015-03-16T06:46:00

Solution 1

It is obvious that ViewState["lbl"] is NULL!
You ask why - I can't say for sure, but the most common cause is that your buttons are doing full-page-postback and while there resetting ViewState...
Wrap you clicks in UpdatePanel ot force them to do partial-postback...
This article may give you a start: http://ajax.net-tutorials.com/controls/updatepanel-control/[^]

Posted 16-Mar-15 6:46am

Kornfeld Eliyahu Peter

v2

Comments

Sergey Alexandrovich Kryukov 16-Mar-15 14:21pm

5ed... :-)
—SA

Kornfeld Eliyahu Peter 16-Mar-15 15:30pm

Thank you...