QueryString errr: Object reference not set to an instance of an object

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Hello everybody,

I want to transfer gridview cells values from one page to another. Here I used query string but to shock its working for some fields and for other fields(gridview cell values) its not working.

The page which has gridview I used this syntax:

VB

Public ReadOnly Property email() As String
      Get
          Return GridView1.SelectedRow.Cells(3).Text
      End Get
  End Property

The page where i want to use those values I used this syntax

VB

lblemail.Text = Request.QueryString("email").ToString

Error: Object reference not set to an instance of an object

Thanks for your help..

Posted 2-Jan-12 21:05pm

mirzamujib

Updated 2-Jan-12 21:27pm

Mehdi Gholam

v2

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Abhinav S · Accepted Answer · 2012-01-02T21:08:00

Solution 1

blemail.Text = Request.QueryString("email").ToString

Ensure that you have a querystring parameter with the name email.
This appears to be null and converting a null to a string is throwing the error.

To remove the error, you can use Convert.ToString(Request.QueryString("email"));.
This will help you avoid an error when your querystring has no email.

However, nothing will be displayed in the blemail.Text control.

Posted 2-Jan-12 21:08pm

Abhinav S

Comments

mirzamujib 3-Jan-12 3:25am

Thanks Abhinav,

But where should i give the querystring parameter...
can u plz gime syntax...

thanks again...

Abhinav S 3-Jan-12 3:32am

You dont need to use the query string syntax. Just use Convert.Tostring instead of ToString().

mirzamujib 3-Jan-12 3:42am

Thanks Abhinav,

I tried and its shows me null value in my lblemail (label).

Abhinav S 3-Jan-12 5:26am

So your error is gone.
Now check if you are passing email in the querystring (this is nothing but the URL for the webpage).
Note that query string parameters are case-sensitive.

mirzamujib · Accepted Answer · 2012-01-02T22:45:00

Solution 2

C#

grdviewLink.NavigateUrl +="&email=" + Me.GridView1.SelectedRow.Cells(3).Text

Add the field to navigate URL...

Posted 2-Jan-12 22:45pm

mirzamujib

Updated 3-Jan-12 9:57am

v2

Comments

Wendelius 3-Jan-12 15:57pm

Pre tags added