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Simple VB.net passing data from .vb file to .aspx file

Posted on 2008-06-18
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Last Modified: 2013-11-26
I am looking to select data from a database in the .vb file so I can do an if/then statement. I then want that information to display on the .aspx page, in a gridview, or however it would be easiest. I am new to VB.net and just now getting a handle on it.

Below is the code for both the .vb file and the .aspx file. I think I have the connection string setup correctly but im not sure how to do the if/then in the .vb file. additionally I am stumped on how to get this to talk to the .aspx page and display the data.

Thanks for your help
---.vb file---
Imports System.Data.SqlClient
Partial Class _Default
    Inherits System.Web.UI.Page
    
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim now = Date.Now
        Dim Conn As New SqlConnection("Initial Catalog=court_dms;Data Source=DINO;Integrated Security=no; User ID=norton;PWD=goldcat13")
        Dim SQL As String
        SQL = "SELECT * FROM court_gbs"
        Dim Comm As New SqlCommand(SQL, Conn)
        If court_gbs.judge = hoover Then
            Response.Write("test value")
        End If
        Conn.Close()
    End Sub
End Class
 
 
 
---.aspx file---
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    <asp:GridView ID="GridView1" runat="server">
    </asp:GridView>
    </form>
</body>
</html>

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Question by:drocco21
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7 Comments
 
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Author Comment

by:drocco21
ID: 21812089
Here is the error, and also court_gbs is my table name, and judge is a column

Compiler Error Message: BC30451: Name 'court_gbs' is not declared.

Source Error:

 

Line 9:          SQL = "SELECT * FROM court_gbs"
Line 10:         Dim Comm As New SqlCommand(SQL, Conn)
Line 11:         If court_gbs.judge = hoover Then
Line 12:             Response.Write("test value")
Line 13:         End If
 
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Accepted Solution

by:
Jeff Certain earned 500 total points
ID: 21812147
It looks like you're missing a few pieces. First is how you get the data; ADO .NET uses a disconnected data model.

Dim dtJudges as New DataTable("Judges")
Using conn As New SqlConnection("Initial Catalog=court_dms;Data Source=DINO;Integrated Security=no; User ID=norton;PWD=goldcat13")
  Using cmd As New SqlCommand("SELECT * FROM court_gbs", conn)
    Using da As New SqlDataAdapter(cmd)
      da.Fill(dtJudges)
    End Using
  End Using
End Using
 
Now, you need to bind the datatable to the grid.
GridView1.DataSource = dtJudges

It's been a while since I've used ASP.NET, do I don't recall... you might have to add
GridView1.DataBind



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LVL 1

Author Comment

by:drocco21
ID: 21812715
Hello, I did what you stated above, but it is now saying the datatable is not defined. Below is the error and the new code:

Compiler Error Message: BC30002: Type 'DataTable' is not defined.

Source Error:

 

Line 4:      
Line 5:      Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Line 6:          Dim dtJudges As New DataTable("Judges")
Line 7:          Using conn As New SqlConnection("Initial Catalog=court_dms;Data Source=DINO;Integrated Security=no; User ID=norton;PWD=goldcat13")
Line 8:              Using cmd As New SqlCommand("SELECT * FROM court_gbs", conn)
 

Imports System.Data.SqlClient
Partial Class _Default
    Inherits System.Web.UI.Page
    
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim dtJudges As New DataTable("Judges")
        Using conn As New SqlConnection("Initial Catalog=court_dms;Data Source=DINO;Integrated Security=no; User ID=norton;PWD=goldcat13")
            Using cmd As New SqlCommand("SELECT * FROM court_gbs", conn)
                Using da As New SqlDataAdapter(cmd)
                    da.Fill(dtJudges)
                End Using
            End Using
        End Using
        GridView1.DataSource = dtJudges
    End Sub
End Class

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LVL 1

Author Comment

by:drocco21
ID: 21812781
OK, I was playing with this and in VS it recommended adding the following:
Imports System.Data
It now is working without error, but is a blank page with no data, not sure what that is all about. If this imports System.Data is wrong feel free to yell lol
Imports System.Data.SqlClient
Imports System.Data
 
Partial Class _Default
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim dtJudges As New DataTable("Judges")
        Using conn As New SqlConnection("Initial Catalog=court_dms;Data Source=DINO;Integrated Security=no; User ID=norton;PWD=goldcat13")
            Using cmd As New SqlCommand("SELECT * FROM court_gbs", conn)
                Using da As New SqlDataAdapter(cmd)
                    da.Fill(dtJudges)
                End Using
            End Using
        End Using
        GridView1.DataSource = dtJudges
    End Sub
End Class

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Expert Comment

by:Jeff Certain
ID: 21813291
You'll also need to import System.Data.SqlClient.

I'm assuming that you're using SQL Server as your back end database.

Did you try adding GridView1.DataBind?
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LVL 1

Author Comment

by:drocco21
ID: 21813336
Sorry, should have paid more attention to what you said the first time, about the databind. I added the databind and all is well, thanks so much for your help. I have one more question and will put a link on the bottom of this, relating to if/then, then I am done. Below is the working code:
Imports System.Data.SqlClient
Imports System.Data
 
Partial Class _Default
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim dtJudges As New DataTable("Judges")
        Using conn As New SqlConnection("Initial Catalog=court_dms;Data Source=DINO;Integrated Security=no; User ID=norton;PWD=goldcat13")
            Using cmd As New SqlCommand("SELECT * FROM court_gbs", conn)
                Using da As New SqlDataAdapter(cmd)
                    da.Fill(dtJudges)
                End Using
            End Using
        End Using
        GridView1.DataSource = dtJudges
        GridView1.DataBind()
    End Sub
End Class

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Author Closing Comment

by:drocco21
ID: 31468305
Thanks
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