CODEWITHSUNDEEP
c#asp.net
user544079
user544079

Reputation: 16629

Reading controls from previous page in asp.net

I have Page1.aspx containing

Name: <asp:TextBox ID="txt1" runat="server" />

Page2.aspx tries to access its contents by 

   TextBox txt2 = (TextBox)PreviousPage.FindControl("txt1");

However I end up getting an Object reference not set to instance of an object exception

Upvotes: 1

Views: 5097

Answers (2)

Moka
Moka

Reputation: 262

Once your'e in the new page, the last page is probably gone, I'd suggest transferring your data over the session.

Upvotes: -2

adaam
adaam

Reputation: 3706

I've used PreviousPage before and have had success with this snippet of code I found elsewhere online (Can't remember where I found it!)

So..

Option 1:

On your first page you have your button that takes you to the second page, you need to set the PostBackUrl property to the new page url:

<asp:Button ID="button1" Runat="server" Text="submit" PostBackUrl="~/Page2.aspx" />

(This is presuming that your 1st page is a form that redirects to your Page2.aspx)

Then in the new page's code behind you need to write something along the lines of this:

public void page_load()
{
if(!IsPostBack)
{
TextBox tb = (TextBox)PreviousPage.FindControl("txt2");
Response.Write(tb.Text);}
}

You will need to transfer the value of the previous page's txt2.Text to a textbox or label on the new page if you are wanting to do any more postbacks on the second page, otherwise you will lose that value.

Option 2:

You could also use a Session variable surely to store your data?!

Session["text"] = txt2.Text;

Upvotes: 3

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