Language Basics ASP.Net

<%@ Page Language="C#" %>

void page_Load()
{
    if(Page.IsPostBack)
    {
        switch (txtIn.Text)
        {
            case "yes":
              lblOut.Text= "yes";
              break;
        
            case "YES":
              lblOut.Text= "YES";
               break;
        
            case "Yes":
              lblOut.Text= "Yes";
              break;
        
            case "no":
              lblOut.Text= "no";
              break; 
        
            case "NO":
              lblOut.Text= "NO";
              break; 
        
            case "No":
              lblOut.Text= "No";
              break; 
        
            default:
              lblOut.Text = "Your answer " + txtIn.Text + " is not recognized.";
                  break;
        }
    
    }
}


    
    
    
        
            Please type yes or no: