ASP.net webpage troubleshooting required

  • Thread starter Thread starter DemiAngel
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    Troubleshooting
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SUMMARY

The discussion focuses on troubleshooting an ASP.NET webpage for student marks evaluation. Key issues include syntax errors in the C# code, particularly in the if-else statements and the use of boolean operators. The user is advised to correct the syntax for "else if" and to understand the difference between the boolean operators "||" (OR) and "&&" (AND). Additionally, the user is encouraged to simplify the logic to avoid unnecessary boolean checks.

PREREQUISITES
  • Understanding of ASP.NET Web Forms
  • Familiarity with C# programming language
  • Knowledge of control structures (if-else statements)
  • Basic understanding of boolean logic in programming
NEXT STEPS
  • Review C# syntax for if-else statements and boolean operators
  • Learn about ASP.NET Web Forms event handling
  • Explore debugging techniques in Visual Studio for ASP.NET applications
  • Investigate best practices for form validation in ASP.NET
USEFUL FOR

Web developers, particularly those working with ASP.NET, students learning C# programming, and anyone involved in creating web forms for data input and evaluation.

DemiAngel
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Hi, I'm working on a students marks evaluation webpage, unfortunately i run into several problems and i need some help fixing it :smile:

Code: 
<%@ Page Language="C#" %>
<script runat="server">

    void submit(object sender, System.EventArgs e)
    {
    lblMessage1.Text = TextBox1.Text;
    lblMessage2.Text = TextBox2.Text;
    lblMessage3.Text = DropListItem.SelectedItem.Text;
    }
    void Calculate(Object sender, System.EventArgs e)
    {
    int TotalGrade = Convert.ToInt32(TextBox3.Text) +
    Convert.ToInt32(TextBox4.Text) + Convert.ToInt32(TextBox5.Text);
    lblMessage4.Text = TotalGrade.ToString();
    }
    int Result
    {
    get { return Convert.ToInt32(lblMessage4.Text); }
     if (TotalGrade <= 100 || TotalGrade >= 90)
         lblMessage5.Text = "A, Excellent!";
     }
     else
     {
       if (TotalGrade <= 89 || TotalGrade >= 80)
         lblMessage5.Text = "B, Very Good!";
     }
     else
     {

        if (TotalGrade <= 79 || TotalGrade >= 70)
         lblMessage5.Text = "C, Good!";

     else
     {
        if (TotalGrade <= 69 || TotalGrade >= 60)
         lblMessage5.Text = "D, Not Bad!";

     else
     {
        if (TotalGrade <= 59 || TotalGrade >= 50)
         lblMessage5.Text = "E, Work Harder!";

     else
     {
        if (TotalGrade <= 49)
         lblMessage5.Text = "F, You Failed!";

</script>
<html>
<head>
    <title></title>
</head>
<body dir="ltr">
    <form runat="server">
        <p align="center">
        </p>
        <p align="center">
            <strong><font size="5"><u></u></font></strong>
        </p>
        <p align="center">
            <strong><font size="5"><u></u></font></strong>
        </p>
        <p align="center">
            <strong><font size="5"><u></u></font></strong>
        </p>
        <p align="center">
            <strong><font size="5"><u></u></font></strong>
        </p>
        <p align="center">
            <strong><font size="5"><u></u></font></strong>
        </p>
        <p align="center">
            <strong><font size="5"><u></u></font></strong>
        </p>
        <p align="center">
            <strong><font size="5"><u></u></font></strong>
        </p>
        <p align="center">
            <strong><font size="5"><u></u></font></strong>
        </p>
        <p align="center">
            <strong><font size="5"><u></u></font></strong>
        </p>
        <p align="center">
            <strong><font size="5"><u></u></font></strong>
        </p>
        <p align="center">
            <strong><font size="5"><u>Personal Information Form</u></font></strong>
        </p>
        <p align="center">
            <strong>Enter the Student Name :</strong>
        </p>
        <p align="center">
            <em><u>Student Name</u>:&nbsp;
            <asp:TextBox id="TextBox18" runat="server" Width="179px"></asp:TextBox>
            </em>
        </p>
        <p align="center">
            <strong>Enter the Student ID number :</strong>
        </p>
        <p align="center">
            <em><u>Student ID</u>:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
            <asp:TextBox id="TextBox19" runat="server" Width="179px"></asp:TextBox>
            </em>
        </p>
        <p align="center">
            <strong>Select Subject Code From the List:</strong>
        </p>
        <p align="center">
        </p>
        <p align="center">
            <asp:DropDownList id="DropDownList4" runat="server">
                <asp:ListItem>CIS 101</asp:ListItem>
                <asp:ListItem>CIS 102</asp:ListItem>
                <asp:ListItem>CIS 103</asp:ListItem>
                <asp:ListItem>CIS 110</asp:ListItem>
            </asp:DropDownList>
        </p>
        <p align="center">
            _________________________________
        </p>
        <p align="center">
            <font size="5"><strong><u>Student Grade Evaluation Form</u></strong></font>
        </p>
        <p align="center">
            <strong>Enter the Student Grades:</strong>&nbsp;
        </p>
        <p align="center">
            <em>First Grade:</em>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
            <asp:TextBox id="TextBox15" runat="server" Width="180px"></asp:TextBox>
        </p>
        <p align="center">
            <em>Second Grade:&nbsp;
            <asp:TextBox id="TextBox16" runat="server" Width="180px"></asp:TextBox>
            </em>
        </p>
        <p align="center">
            <em>Final Grade:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<asp:TextBox id="TextBox17" runat="server" Width="180px"></asp:TextBox>
            </em>
        </p>
        <p align="center">
            <em>============================= </em>
        </p>
        <em></em><em>
        <p align="center">
            <asp:Button id="Button2" onclick="submit" runat="server" Width="287px" Text="Get Student Information Now"></asp:Button>
        </p>
        <p align="center">
            <asp:Button id="Button3" onclick="Calculate" runat="server" Width="286px" Text="Get the Total Grade Now"></asp:Button>
        </p>
        </em><em>
        <p align="center">
            Student Name: <asp:Label id="lblMessage1" runat="server"></asp:Label>
        </p>
        <p align="center">
            Student ID: <asp:Label id="lblMessage2" runat="server"></asp:Label>
        </p>
        <p align="center">
            Student Selected Subject: <asp:Label id="lblMessage3" runat="server"></asp:Label>
        </p>
        </em>
        <p align="center">
            <em>Total Grade: </em><asp:Label id="lblMessage4" runat="server" font-italic="True"></asp:Label><em></em>
        </p>
        <p align="center">
            <em></em>
        </p>
        <p align="center">
            <em>&nbsp;Evaluation Letter:&nbsp;</em><asp:Label id="lblMessage5" runat="server" font-italic="True"></asp:Label><em></em>
        </p>
    </form>
</body>
</html>

Mainly i can't fix the #line error that i always get and i can't make the if-else statements to work :mad:

Please help me out & thanks,
 
Technology news on Phys.org
Since this looks like homework I would suggest you look up the difference between the boolean operators || and &&.

You might also think about how you can eliminate the need for the boolean operator altogether.

Last but not least you might want to check the syntax on "else if"
 

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