Create a application using C# and ASP.NET. Design and implement a multi-tier application Solution

Create a application using C# and ASP.NET. Design and implement a multi-tier application. The data will be stored in an XML file. You will first create an XML file using a text editor of your choice. Specifically, you will create an XML file that holds 24 final student grades. The application you create will read and parse the grades from the XML file (stored on the server). The application will then calculate the average grade, the lowest grade, and the highest grade and return this information to a browser page, using a form to display the values.

I do not understand how to create the multi-tier application in Visual Basic. I have created the XML file and put it on my server. Please help me with creating the application in C#.

Read and parse the grades from the studentGrades.xml. Determine the lowest grade, the highest grade, and the average grade. Display these values to the screen in graphical user interface form not console output.