Need help with this Null Exception

[Lock]

I have done this in the initial work file and everything went fine. After i integrate this into the project, this error ->  "System.NullReferenceException: Object reference not set to an instance of an object." appear.

Stack Trace: 

[NullReferenceException: Object reference not set to an instance of an object.]
UltimateFurniture.CustomerReg.btnConfirm_Click1(Object sender, EventArgs e) in C:\Users\Ang yong xin\Documents\ecommerce application project\UltimateFurniture backup(6)\UltimateFurniture\UltimateFurniture\Register.aspx.cs:85
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +9752554
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +196
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1724