Object reference not set to an instance of an object.

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I am using this code in my button event. But i am receiving this error Object reference not set to an instance of an object.[]

VB

Try
            Dim cmd As SqlCommand
            Dim con As SqlConnection = New SqlConnection("Data Source=ALI-PC\SQLEXPRESS;Initial Catalog=estate_portal;Integrated Security=True")
            Dim sqlstring As String
            sqlstring = "INSERT INTO [Proprties] ([Address], [Price], [Size], [Beds], [Bath], [Status], [Opening_Status], [Image], [PostedBy]) VALUES ('" + Textbox4.Text + "', '" + Textbox5.Text + _
                "', '" + Textbox5.Text + "', '" + Textbox5.Text + "', '" + Textbox5.Text + "', '" + Textbox5.Text + "', '" + Textbox5.Text + "', '" + Textbox5.Text + "', '" + Textbox5.Text + "')"
            con.Open()
            cmd = New SqlCommand(sqlstring, con)
            cmd.ExecuteNonQuery()
            Errors.Text = ("Success")
            dr.Close()
        Catch ex As Exception
            Errors.Text = (ex.Message)
        End Try

Posted 18-Jan-13 4:23am

roxtarali

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-01-18T13:39:00

This is one of the easiest exceptions to detect and fix. It simply means that some member/variable of some reference type is dereferenced by using and of its instance (non-static) members, which requires this member/variable to be non-null, but in fact it appears to be null. Simply execute it under debugger, it will stop the execution where the exception is thrown. Put a break point on that line, restart the application and come to this point again. Evaluate all references involved in next line and see which one is null while it needs to be not null. After you figure this out, fix the code: wither make sure the member/variable is properly initialized to a non-null reference, or check it for null and, in case of null, do something else.

See also: want to display next record on button click. but got an error in if condition of next record function "object reference not set to an instance of an object"[^]

—SA

Abhinav S · Accepted Answer · 2013-01-18T04:29:00

Solution 1

Try debugging your source code. You will find you are accessing a property or method on an object that is null.
In this case looks like you have not instantiated the variable dr.

Posted 18-Jan-13 4:29am

Abhinav S

Comments

roxtarali 18-Jan-13 10:35am

Yeah you was right it i forget to con.close instead of dr.close :P well thanks :)

Abhinav S 18-Jan-13 11:37am

You are welcome.

fjdiewornncalwe 18-Jan-13 11:29am

My 5.

Abhinav S 18-Jan-13 11:37am

Thank you.

Espen Harlinn 18-Jan-13 11:46am

5'ed!

Abhinav S 18-Jan-13 12:03pm

Thank you Espen.

Sergey Alexandrovich Kryukov 18-Jan-13 19:40pm

Correct, my 5, but I have some extra advice on the topic; please see Solution 2.
—SA

Abhinav S 19-Jan-13 1:46am

Thank you.