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Getting null reference when referencing public variable from another page

jvalescu
jvalescu asked
on
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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
        {
 
            set
            {
                if (value == null)
                {
                    value = "";
                }
                mControl = value;
               
            }
 
            get
            {
                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;
        }

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