When I Run Forgot Password Page Then Object Reference Not Set To An Instance Of An Object. Error Is Arised.

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C#

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                BindQuestion();
                SqlConnection con = new SqlConnection("Data Source=MSPLMC0011\\SQLEXPRESS;Initial Catalog=thursday;User ID=sa;Password=multiverse@1");
            }
        }

        private void BindQuestion()
        {
            SqlConnection con = new SqlConnection("Data Source=MSPLMC0011\\SQLEXPRESS;Initial Catalog=thursday;User ID=sa;Password=multiverse@1");
            SqlDataAdapter da = new SqlDataAdapter("Select * from SecurityQuestion", con);
            con.Open();
            DataSet ds = new DataSet();
            da.Fill(ds);

            Question.DataSource = ds.Tables[0];
            Question.DataBind();
            Question.Items.Insert(0, new ListItem("-Select Question-", ""));
        }

        protected void btn_Submit_Click(object sender, EventArgs e)
        {

            try
            {
                if (ViewState["ans"].ToString() == txtans.Text)
                {

                    lblans.Visible = true;
                    lblans.Text = "Your Password is :" + ViewState["password"].ToString();

                }
                else
                {
                    lblans.Visible = true;
                    lblans.Text = "ans not match...";

                }
            }
            catch (Exception ex)
            {
                lblans.Visible = true;
                lblans.Text = ex.Message;
            }
        }

        protected void Question_SelectedIndexChanged(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection("Data Source=MSPLMC0011\\SQLEXPRESS;Initial Catalog=thursday;User ID=sa;Password=multiverse@1");
            SqlDataAdapter da = new SqlDataAdapter("Select SecurityQuestion, SecurityID from SecurityQuestion", con);
            con.Open();
            DataSet ds = new DataSet();
            da.Fill(ds);

            Question.DataSource = ds.Tables[0];
            Question.DataBind();
            Question.Items.Insert(0, new ListItem("---Select Question----", ""));
        }

Posted 19-Aug-14 20:48pm

Member 11023602

Updated 19-Aug-14 21:01pm

Thanks7872

v2

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Comments

Mayank Vashishtha 20-Aug-14 2:51am

Why don't you use Debugger?

Member 11023602 20-Aug-14 2:54am

Where i used Debugger

Kumarbs 20-Aug-14 2:59am

In your code

Thanks7872 20-Aug-14 3:00am

In visual studio, press f9 at bindquestion/btn_Submit_Click method to set break point. Then run your app. This breakpoint will get hit and then press f10 to step through each line. Check the line at which you got error, you will find any object as null. Resolve it such that it should not be null.

Gupta Poonam 20-Aug-14 3:13am

Have you set the DataTextField and DataValueField property of your dropdownlist?

Sanchayeeta 20-Aug-14 3:13am

Which line you are getting error?

Raul Iloc 20-Aug-14 7:45am

Did you fix the problem as I suggested in my solution?

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Raul Iloc · Answer 1 · 2014-08-19T21:01:00

Solution 1

At the first code review the error seems to be generated in your btn_Submit_Click method from the next line:

C#

if (ViewState["ans"].ToString() == txtans.Text)

The value from ViewState may be null, so you should correct it with:

C#

if (ViewState["ans"] != null && ViewState["ans"].ToString() == txtans.Text)

PS: You forgot to mention the line of code that generate the error.

Posted 19-Aug-14 21:01pm

Raul Iloc

Comments

Member 11023602 20-Aug-14 3:03am

ok..
and

Raul Iloc 20-Aug-14 7:26am

Did you fix the problem as I suggested?

Sharmanuj · Answer 2 · 2014-08-19T21:27:00

make sure your viewstate objects does not have null value. check before assigning the values for viewstate objects.

C#

if(ViewState["ans"]!=null && ViewState["Password"]!=null)
{
// set the values
}

Also this is not a good practice to open the connection at each stage by giving connection string. Follow some coding rules to make your efficient code.

Vinay Mistry · Answer 3 · 2014-08-19T22:17:00

Solution 3

I think you have missed one step before btn_Submit_Click. In which step you will set your both ViewState. Above solutions are for checking whether your ViewState null or not.

Posted 19-Aug-14 22:17pm

Vinay Mistry

Zubairk1990 · Answer 4 · 2014-08-20T00:30:00

Solution 4

Check with code and put debugger. There must be some problem with ViewState.
your ViewState would be null or blank..

Posted 20-Aug-14 0:30am

Zubairk1990

Yash Raichura · Answer 5 · 2014-09-09T18:29:00

Solution 5

Please put Debugger so we Can Understand From Where The Object Reference Be Null..@Vinay it is not necessary that problem is Of ViewState...But He Should Pass The Object..And It Should Be null That Is Checked By Debugger Then Only We Can Catch UP....!!!!
Thanks

Posted 9-Sep-14 18:29pm

Yash Raichura