IsPostBack() to display message from SQL Stored Procedure

Posted on 2009-05-14
Last Modified: 2012-05-07
I am trying to created a form that will allow a member to enter their member number in the text field and press the enter key to send it to the database for verification of membership.  If the members number is valid it timestamps the time they entered, if the number is invalid it returns a message letting them know it expired.

I have the valid number process working, but not the invalid numbers.  When an invalid number is entered it crashes the page.  In the dump how ever is the error message from the stored procedure that I would like to display on the page and return the focus to the text field for the next entry.

This is what I get back when entering an invalid member number.

Stack Trace:
[SqlException (0x80131904): This badge number is invalid, please see the Membership Desk.]

What am I missing here, thanks in advance.
protected void Page_Load(object sender, SqlDataSourceStatusEventArgs e)
        if (!this.IsPostBack)
            // done only during initialization
            TextBox tbox = (TextBox)frmSignIn.FindControl("txtEnrollNumber");
            Button btn = (Button)frmSignIn.FindControl("btnSubmit");
            this.form1.DefaultFocus = tbox.UniqueID;
            this.form1.DefaultButton = btn.UniqueID;
            // done only during postback
            Label lblErrMsg = (Label)form1.FindControl("lblErrorMessage");
            if (e.Exception != null)
                lblErrMsg.Text = "";
                lblErrMsg.Text = e.Exception.Message;
                e.ExceptionHandled = true;

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Question by:DGP_Tech
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Expert Comment

ID: 24390857
Hi There,

Post a link to the page so we can have a look at it.


Author Comment

ID: 24390867
Unfortunately it is an internal page, but I added the page code here.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="SignInForm.aspx.cs" Inherits="SignInForm" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<head runat="server">
    <link href="css/global.css" rel="stylesheet" type="text/css" />
    <title>PRCI - Membership Meeting Sign In</title>
    <form id="form1" runat="server">
        <span class="pgtitle">Meeting with Tribal Council</span>    
        <div class="datedisplay">
            <script src="scripts/datedisplay.js" type="text/javascript"></script>
    <asp:FormView ID="frmSignIn" DataKeyNames="EnrollNumber" DataSourceID="srcSignIn" DefaultMode="Insert" runat="server">
        <asp:RequiredFieldValidator ID="rfvEnrollNumberExist" runat="server" SetFocusOnError="true" ControlToValidate="txtEnrollNumber" Display="Dynamic" CssClass="reqmsg">
		    <div>"Enrollment Number" is a required field.</div>
		<asp:Label ID="lblErrorMessage" CssClass="errmsg" runat="server" Text=""></asp:Label>
        <asp:Label ID="lblEnrollNumber" CssClass="txtlabel" Text="Enrollment Number:" AssociatedControlID="txtEnrollNumber" runat="server" /><br />
        <asp:TextBox ID="txtEnrollNumber" Text='<%# Bind("EnrollNumber", "{0}") %>' CssClass="tbox" runat="server" TabIndex="0" AutoPostBack="True" /><br />
        <asp:Button ID="btnSubmit" Text="Submit" CommandName="Insert" CssClass="sbtn" runat="server" TabIndex="1" />
    <asp:SqlDataSource ID="srcSignIn"
        InsertCommand="sp_SignIn_Insert" InsertCommandType="StoredProcedure"
        ConnectionString="<%$ ConnectionStrings:PerCapitaConnectionString %>"
            <asp:Parameter Name="EnrollNumber" Type="String" />

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LVL 11

Accepted Solution

Muhammad Ousama Ghazali earned 500 total points
ID: 24391076
I am not sure but can we have SqlDataSourceStatusEventArgs in the Page_Load event as is your code suggesting?
I think you may need to change the following line;
Page_Load(object sender, SqlDataSourceStatusEventArgs e)
Page_Load(object sender, System.EventArgs e)
For handling exceptions you may need to use some appropriate event of SqlDataSource or Page/Page Controls.
For detail on SqlDataSource, see this link:
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LVL 11

Expert Comment

by:Muhammad Ousama Ghazali
ID: 24391128
I have some more information for you.
If you are going to use the SqlDataSource for SELECT, INSERT, DELETE, UPDATE you have to put exception handling code in respective events of the SqlDataSource. If you wish to perform only SELECT statement within your SqlDataSource, do the exception handling code within Selected event only. See the code below for more reference, for brevity reasons, the exception handling sample code is written only in Selected event.

	Private Sub srcSignIn_Deleted(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SqlDataSourceStatusEventArgs) Handles srcSignIn.Deleted
	End Sub
	Private Sub srcSignIn_Inserted(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SqlDataSourceStatusEventArgs) Handles srcSignIn.Inserted
	End Sub
	Private Sub srcSignIn_Selected(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SqlDataSourceStatusEventArgs) Handles srcSignIn.Selected
		If e.Exception IsNot Nothing Then
			lblMessage.Text = e.Exception.Message
			e.ExceptionHandled = True
			lblMessage.Text = String.Empty
			lblMessage.Visible = False
		End If
	End Sub
	Private Sub srcSignIn_Updating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.SqlDataSourceCommandEventArgs) Handles srcSignIn.Updating
	End Sub

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LVL 11

Expert Comment

by:Muhammad Ousama Ghazali
ID: 24391141
I just again read your provided code, if that is working for you, try changing this line of your code:
if (e.Exception != null)
if (e.Exception == null)
and see if your requirements are met.

Author Comment

ID: 24399508
Moghazali - I tried the second suggestion with the code changing it to ==null, but it did not seem to make a difference.
As for the seperate sub routine, I am using C# and this looks to be in VB (please correct me if I am wrong).  I did try placing it outside fo the page load in: protected void but did not get anywhere with it.  
And now in playing with the code the page is not allowing the enter key to act as a click on the Submit button after entering in the number.
Going backwards here.
LVL 11

Expert Comment

by:Muhammad Ousama Ghazali
ID: 24400260
I am assuming you have named your SqlDataSource srcSignIn. In the code behind file, write the following code in the Selected event of srcSingIn object. For this you may have to choose the srcSignIn in top-left drop down within Code Editor and choose Selected from the top-right drop down in Code Editor.
The above is neccessary as I mentioned earlier having SqlDataSourceStatusEventArgs in Page_Load event is incorrect. The right place for coding/handling exceptions for SqlDataSource is its four events i.e. Selected, Deleted, Inserted, and Updated. If you perform any of these operations using the SqlDataSource object, you should write code in respective event to handle exceptions.

if (e.Exception != null) {
  lblMessage.Text = e.Exception.Message;
  e.ExceptionHandled = true;
  lblMessage.Text = string.Empty;
  lblMessage.Visible = false;

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Author Comment

ID: 24400387
Moghazail,  thank you.  I am reading through the information provided in the link and looking over the code and other advice here.  Unfortunatly I am a one man shop and today has just been all but here working on this.  I will keep you posted.

Author Closing Comment

ID: 31581731
Thank you very much, that was a lot of information within the link and if did lead to a solution.  Thank you again.

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