ASP.NET MVC - How to update and upload complex Excel file

 public partial class CategoryLevel 

{ 

public long CategoryID { get; set; } 

public string CategoryName { get; set; } 

public string OPTION_VALUE { get; set; } 

public Nullable ParentID { get; set; } 

public Nullable ParentID1 { get; set; } 

public Nullable ParentID2 { get; set; }

Without clicking twice to upload, it will retrieve the data it has saved to perform the following manipluations.

1. From the Excel, Where Category Code is equal to Parent Category, it means its a child of the corresponding parent. So, it will save the CategoryID of its parent as its ParentID
2. From the Excel, where Category Name is Null, it means its a root and has no parent
3. ParentID1 is the Level - It can get to level N
4. ParentID of the Root Category(Level 1) will be set to 0
5. ParentID of the Child Category will be the CategoryID of the direct parent
6. Note that CategoryID is System Generated (auto-increment)

Please how do I achieve this using the same controller, and also with the same instance of upload.