Use redirect option in a class

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Hellow.i have a class Called Students where i have several methods.In my method for creating students,i first check if that student exists then i throw error back to him if found.What it brings back to me is the Exception since i have used a throw statement and it brings that annoying YELLOW SCREEN OF DEATH .I need someone to tell me how i can use a response.redirect so as instead of throwing that error,it redirects him to a custom error page i have created,

Here is the code on the Students Class

C#

Student exist = db.Students.FirstOrDefault(x => x.studentName == studentName);
           if (exist != null)
           {


               throw new Exception("Student Exists");
           }

Any how i can use a redirect to my error page or how i can call it on my webform code behind to use the line their?Thanks

Posted 22-Jan-14 2:39am

Member 10398773

Updated 22-Jan-14 2:40am

v2

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Karthik_Mahalingam 22-Jan-14 9:03am

Student is a webpage or separate class ?

Member 10398773 22-Jan-14 9:13am

It's a separate class

Karthik_Mahalingam 22-Jan-14 9:17am

ok

3 solutions

Solution 1

Hello,
You have to use a Global.asax file, and implement the Application_Error method :
MSDN : How to: Handle Application-Level Errors[^]

Posted 22-Jan-14 3:15am

Ahmed Bensaid

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nitinbljoshi · Accepted Answer · 2014-01-22T03:16:00

For this you will have to write error handling code in Application_Error event handler in the Global.asax file. It is called when any unhandle exception occurs.

Code as follows:

C#

void Application_Error(object sender, EventArgs e)
{
    // Code that runs when an unhandled error occurs

    //Redirect to custom error page and if required pass error code and error message to the custom error page using query string or some other mechenism.
    Response.Redirect("CustomErrorPage.aspx");

}

Karthik_Mahalingam · Accepted Answer · 2014-01-22T03:24:00

try like this

in the Student class modify the method like this

C#

public bool IsStudentExist(string studentName)
    {
        Student exist = db.Students.FirstOrDefault(x => x.studentName == studentName);
        return exist != null;

    }

And in the page where you are calling that method to check the student exists ,
like this

C#

Student obj = new Student();
       bool isexist = obj.IsStudentExist("studendName");
       if (isexist)
           Response.Redirect("Error.aspx?Message=Student Exists");

Create an Error page as follows

XML

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h3>
            <asp:Label ID="lblMessage" runat="server"></asp:Label>
        </h3>
    </div>
    </form>
</body>
</html>

C#

protected void Page_Load(object sender, EventArgs e)
        {
            lblMessage.Text = Request.QueryString["Message"];
        }

Use redirect option in a class

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