Simple Login Project

Question

Hi, I followed one of the articles in c#corner, but I still have trouble accessing the Login page.  I typed the exact User Name and Password but I still have an error message, "Invalid User Name and Password". 
I have upload the souce code on both Login.aspx.cs and the WebConfig files in zip format.
Can someone help me to solve this problem so I can move on the project?
Thank you.