I am new to .NET Platform, I am from J2EE background.I don't have problem in reading the code. However i am not quite familiar with the Runtime environment

Task provided to me:

I need to migrate an ASP.NET C# website from IIS 6.0 to IIS 8.5.

My Actions so far:

  1. Published the website using Visual studio 2010
  2. The website uses Oracle database hence i have installed Oracle client and configured the database in tnsnames.ora
  3. Added the published website to the IIS 8.5 server using "add website" option and started the website

Environment details:

  1. TO-BE Runtime: IIS 8.5 , Microsoft Windows Server 2012R2
  2. AS-IS Runtime : IIS 6.0 , Oracle database is being used by the website.

Problem: The default webpage is getting loaded, however when i click a button, i noticed the following exception in windows events

    Exception information: 
    Exception type: NullReferenceException 
    Exception message: Object reference not set to an instance of an object. 

Request information: 
    Request URL: http://172.21.126.88:28080/Profile.aspx 
    Request path: /Profile.aspx 
    User host address: 10.30.54.97 
    User:  
    Is authenticated: False 
    Authentication Type:  
    Thread account name: IIS APPPOOL\.NET v2.0 

Thread information: 
    Thread ID: 14 
    Thread account name: IIS APPPOOL\.NET v2.0 
    Is impersonating: False 
    Stack trace:    at Code_Profile.btnGetCustDet_Click(Object sender, EventArgs e)
   at System.Web.UI.WebControls.Button.OnClick(EventArgs e)
   at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
   at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Exception related code

ASP.net page with Button click action

  <td>
<asp:Button ID="btnGetCustDet" runat="server" OnClick="btnGetCustDet_Click" Text="Get Details" Width="111px" />
</td>

C# function handling that event.

protected void btnGetCustDet_Click(object sender, EventArgs e)
    {
        txtBoxCustNameE.Text = "Button click entry";

Couldn't locate exactly where this exception is getting triggered. as per exception trace, at Code_Profile.btnGetCustDet_Click(Object sender, EventArgs e) But even the first line of btnGetCustDet_Click is not getting executed. So i am stuck here

Please advise , i suspect some migration issue. Please let me know if there is any standard procedure to perform and validate this migration

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