VB.NET ASP.NET Sql Command Delete Statement Source Code Example

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Sql Command Delete Statement

Purpose: – Illustrates using Sql Command Delete Statement in VB.NET ASP.NET.

Prerequistes:

1. Install Visual Web Developer 2008
2. Install SQL Server Express
3. Download Northwind and Pubs Databases
4. Attach Northwind Database to Databases in Sql Express
5. Attach pubs Database to Databases in Sql Express

Notes:

• You can build your own library of syntax examples by using same web site over and over and just add new web forms to it.

Instructions:

1. Use Visual Web Developer 2008
2. Create new web site;
   • Click File/New Web Site
   • Select ASP.NET Website Template
   • Select Visual Basic for Language
   • name of Web Site could be VBNET_ASPNET_Syntax.
3. Add New folder named "Database_ADONET"
   • Right-click project name in solution explorer;
   • add new folder;
   • name of folder could be: Database_ADONET
4. Add Web Form Named SqlCommandDelete to Database_ADONET folder
   • Right-click Database_ADONET folder;
   • add new item;
   • Select Web Form
   • Check place code behind in separate file
   • Web Form name could be SqlCommandDelete
5. Click on copy code in code below to copy code into web form SqlCommandDelete.aspx
6. Click on copy code in second set of code below to copy code into code-behind SqlCommandDelete.aspx.vb
7. Right-click on SqlCommandDelete.aspx in solution explorer and select view in browser

Step 1: Click on Copy Code to Cut-n-paste code into SqlCommandDelete.aspx

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<%@ Page Language="VB" AutoEventWireup="false" CodeFile="SqlCommandDelete.aspx.vb" Inherits="Database_ADONET_SqlCommandDelete" %>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head runat="server">
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    <title></title>
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</head>
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<body>
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    <form id="form1" runat="server">
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    <div>
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        <table>
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        <tr>
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        <td>First Name: </td><td>
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        <asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox>
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        </td>
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        </tr>
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        <tr>
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        <td>Last Name: </td><td>
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        <asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>
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        </td>
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        </tr>
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        </table><br />
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        <asp:Button ID="btnDelete" runat="server" Text="Delete" /><br />
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        <asp:Label ID="lblErrMsg" runat="server" Text="lblErrMsg" ForeColor="#FF3300" 
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            Visible="False"></asp:Label><br />
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        <asp:GridView ID="GridView1" runat="server" DataSourceID="sdsEmployees">
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        </asp:GridView>
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        <asp:SqlDataSource ID="sdsEmployees" runat="server" 
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            ConnectionString="<%$ ConnectionStrings:Northwind_ConnectionString %>" 
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            SelectCommand="SELECT [FirstName], [LastName] FROM [Employees]">
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        </asp:SqlDataSource>
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    </div>
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    </form>
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</body>
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</html>
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 Visual Basic | 
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Imports System
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Imports System.Data
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Imports System.Data.SqlClient
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Partial Class Database_ADONET_SqlCommandDelete
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    Inherits System.Web.UI.Page
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    Protected Sub btnDelete_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDelete.Click
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        Dim thisConnection As New SqlConnection(ConfigurationManager.ConnectionStrings("Northwind_ConnectionString").ConnectionString)
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        'Create Command object
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        Dim nonqueryCommand As SqlCommand = thisConnection.CreateCommand()
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        Try
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            ' Open Connection
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            thisConnection.Open()
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            ' Create DELETE statement with named parameters
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            nonqueryCommand.CommandText = _
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               "DELETE Employees WHERE FirstName = @FirstName and LastName = @LastName"
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            ' Add Parameters to Command Parameters collection
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            nonqueryCommand.Parameters.Add("@FirstName", SqlDbType.VarChar, 10)
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            nonqueryCommand.Parameters.Add("@LastName", SqlDbType.VarChar, 20)
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            nonqueryCommand.Parameters("@FirstName").Value = txtFirstName.Text
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            nonqueryCommand.Parameters("@LastName").Value = txtLastName.Text
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            nonqueryCommand.ExecuteNonQuery()
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        Catch ex As SqlException
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            ' Display error
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            lblErrMsg.Text = ex.ToString()
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            lblErrMsg.Visible = True
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        Finally
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            ' Close Connection
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            thisConnection.Close()
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        End Try
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        GridView1.DataBind()
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    End Sub
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    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
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        lblErrMsg.Visible = False
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    End Sub
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End Class
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 XML | 
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<connectionStrings>
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    <add name="Northwind_ConnectionString"
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      connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI" />
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    <add name="Pubs_ConnectionString"
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      connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=pubs;Integrated Security=SSPI" />
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  </connectionStrings>
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