VB.NET ASP.NET DropDownList Bind To Table Source Code Example
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VB.NET ASP.NET DropDownList Bind To Table Source Code
Purpose: – Illustrates using DropDownList and bind to data table for VB.NET ASP.NET.
Prerequistes:
- Install Visual Web Developer 2008
- Install SQL Server Express
- Download Northwind Database
- Attach Northwind Database to Databases in Sql Express
Instructions:
- Use Visual Web Developer 2008
- Select File/new web site; select template ASP.NET website; Select Visual Basic for Language;
name of website in Location field could be VBNET_ASPNET_Syntax.
- Right-click project name in solution explorer; add new folder; name of folder could be Standard_Controls
- Right-click folder; add new item; Select Web Form; check place code behind in separate file;
Web Form Name could be DropDownListBindToTable
- Copy first set of code into DropDownListBindToTable.aspx
- Copy second set of code into DropDownListBindToTable.aspx.vb
- Right-click on DropDownListBindToTable.aspx and select View in Browser
Step 1: Click on XML to Cut-n-paste code into DropDownListBindToTable.aspx
| XML | | copy code | | ? |
< %@ Page Language="VB" AutoEventWireup="false" CodeFile="DropDownListBindToTable.aspx.vb" |
Inherits="Standard_DropDownListBindToTable" %> |
< !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></title> |
</head> |
<body> |
<form id="form1" runat="server"> |
<div> |
<asp:dropdownlist ID="DropDownList1" runat="server"> |
</asp:dropdownlist> |
</div> |
</form> |
</body> |
</html> |
Step 2: Click on VB to Cut-n-paste code into DropDownListBindToTable.aspx.vb
| Visual Basic | | copy code | | ? |
Imports System |
Imports System.Data |
Imports System.Data.SqlClient |
Partial Class Standard_DropDownListBindToTable |
Inherits System.Web.UI.Page |
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load |
Dim con As SqlConnection = New SqlConnection("Server=(local)\SQLEXPRESS;Initial |
Catalog=Northwind;Integrated Security=SSPI") |
Dim cmd As New SqlCommand() |
cmd.CommandText = "SELECT EmployeeID, FirstName + ' ' + LastName as FullName FROM |
Employees" |
cmd.Connection = con |
Dim Table1 As DataTable |
Table1 = New DataTable("Employees") |
'creating a table named Employees |
Dim Row1 As DataRow |
'declaring row for the table |
Dim EmployeeID As DataColumn = New DataColumn("EmployeeID") |
'declaring a column named EmployeeID |
EmployeeID.DataType = System.Type.GetType("System.Int32") |
'setting the datatype for the column |
Table1.Columns.Add(EmployeeID) |
'adding the column to table |
Dim FullName As DataColumn = New DataColumn("FullName") |
FullName.DataType = System.Type.GetType("System.String") |
Table1.Columns.Add(FullName) |
Try |
con.Open() |
Dim reader As SqlDataReader = cmd.ExecuteReader '(CommandBehavior.SingleRow) |
While reader.Read() |
Row1 = Table1.NewRow() |
'declaring a new row |
Row1.Item("EmployeeID") = reader.GetInt32(0) |
'filling the row with values. Item property is used to set the field value. |
Row1.Item("FullName") = reader.GetString(1) |
'filling the row with values. adding FullName |
Table1.Rows.Add(Row1) |
End While |
reader.Close() |
Finally |
con.Close() |
End Try |
DropDownList1.DataSource = Table1 |
Me.DropDownList1.DataTextField = "FullName" |
Me.DropDownList1.DataValueField = "EmployeeID" |
DropDownList1.DataBind() |
End Sub |
End Class |
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Excellent Code!