Question

I am trying to separate all DB calls required by ASCX.cs to call only from ASPX.cs, I am trying it with delegate and events.

my ASCX.cs has

namespace x.xx.xy.xyy.xyyy
{
public partial class PaymentItem : UserControlBase
{      
    public delegate void Handler(Dictionary<string, string> keyvalues);
    public event Handler aPICall;     
}
}

my ASPX.cs has

namespace x.xx.xz.xzz.xzzz
{
public partial class PaymentItemPopUp
{
    protected global::x.xx.xy.xyy.xyyy.PaymentItem ucPaymentItem;

    protected void Page_Load(object sender, EventArgs e)
    {
        this.ucPaymentItem.aPICall += new PaymentItem.Handler(ServiceAPICAll);

    }
protected void ServiceAPICAll(Dictionary<string, string> keyvalues){

}
}
}

I am getting ‘Object reference not set to an instance of an object’ when compiler hits the following line
this.ucPaymentItem.aPICall += new PaymentItem.Handler(ServiceAPICAll);

I suppose the issue from the following line

protected global::x.xx.xy.xyy.xyyy.PaymentItem ucPaymentItem;

any idea?

Answer 1

It works now.

I removed designer generated code for my user control in my aspx page

my ASPX.designer.cs

//protected global::System.Web.UI.UserControl PaymentItem1;

Then I changed like the following

my ASPx.cs

protected global::x.xx.xy.xyy.xyyy.PaymentItem  PaymentItem1; 

My ASPX

<%@ Register Src="~/_xy/xyy/xyyy/PaymentItem.ascx" TagName="PaymentItem" TagPrefix="uc1"  %>
 <uc1:PaymentItem runat="server" ID="PaymentItem1" />