asked on

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

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>

Open in new window

drocco21

ASKER

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

ASKER CERTIFIED SOLUTION

Jeff Certain

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

drocco21

ASKER

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

Open in new window

drocco21

ASKER

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

Open in new window

Jeff Certain

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?

drocco21

ASKER

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

Open in new window

drocco21

ASKER

Thanks