We help IT Professionals succeed at work.
Get Started

Getting null reference when referencing public variable from another page

jvalescu asked
Last Modified: 2012-06-27
I keep getting an "Object Reference Not Set to an Instance of an Object" error when trying to reference a public variable from a previous page.  I have included my code.  This is urgent, so I appreciate your input!

The error occurs because PreviousPage.Control is considered null.  I followed the MSDN example and can't figure out why it doesn't work.  Thanks!

Source page:
 public String Control
                if (value == null)
                    value = "";
                mControl = value;
                return mControl;
 protected void btnAllocate_Click(object sender, EventArgs e)
            Control = GridView1.SelectedValue.ToString();
            if (Control != "" && Control != null)
                Response.Redirect("Allocation.aspx", false);
Destination Page:
<%@ PreviousPageType VirtualPath="~/SearchOrders.aspx" %> 
 protected void Page_Load(object sender, EventArgs e)
           lblControlNumber.Text = PreviousPage.Control;

Open in new window

Watch Question
This problem has been solved!
Unlock 1 Answer and 5 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE