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

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

Example Webform Code:

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="SqlCommandDelete.aspx.vb" Inherits="Database_ADONET_SqlCommandDelete" %>
 
<!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>
        <table>
        <tr>
        <td>First Name: </td><td>
        <asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox>
        </td>
        </tr>
        <tr>
        <td>Last Name: </td><td>
        <asp:TextBox ID="txtLastName" runat="server"></asp:TextBox>
        </td>
        </tr>
        </table><br />
        <asp:Button ID="btnDelete" runat="server" Text="Delete" /><br />
        <asp:Label ID="lblErrMsg" runat="server" Text="lblErrMsg" ForeColor="#FF3300" 
            Visible="False"></asp:Label><br />
        <asp:GridView ID="GridView1" runat="server" DataSourceID="sdsEmployees">
        </asp:GridView>
        <asp:SqlDataSource ID="sdsEmployees" runat="server" 
            ConnectionString="<%$ ConnectionStrings:Northwind_ConnectionString %>" 
            SelectCommand="SELECT [FirstName], [LastName] FROM [Employees]">
        </asp:SqlDataSource>
    </div>
    </form>
</body>
</html>

Example Code Behind:

Imports System
Imports System.Data
Imports System.Data.SqlClient
 
Partial Class Database_ADONET_SqlCommandDelete
    Inherits System.Web.UI.Page
 
    Protected Sub btnDelete_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDelete.Click
        Dim thisConnection As New SqlConnection(ConfigurationManager.ConnectionStrings("Northwind_ConnectionString").ConnectionString)
 
        'Create Command object
        Dim nonqueryCommand As SqlCommand = thisConnection.CreateCommand()
 
        Try
            ' Open Connection
            thisConnection.Open()
 
            ' Create DELETE statement with named parameters
            nonqueryCommand.CommandText = _
               "DELETE Employees WHERE FirstName = @FirstName and LastName = @LastName"
 
            ' Add Parameters to Command Parameters collection
            nonqueryCommand.Parameters.Add("@FirstName", SqlDbType.VarChar, 10)
            nonqueryCommand.Parameters.Add("@LastName", SqlDbType.VarChar, 20)
 
 
            nonqueryCommand.Parameters("@FirstName").Value = txtFirstName.Text
            nonqueryCommand.Parameters("@LastName").Value = txtLastName.Text
 
            nonqueryCommand.ExecuteNonQuery()
 
        Catch ex As SqlException
            ' Display error
            lblErrMsg.Text = ex.ToString()
            lblErrMsg.Visible = True
 
        Finally
            ' Close Connection
            thisConnection.Close()
 
        End Try
        GridView1.DataBind()
    End Sub
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        lblErrMsg.Visible = False
 
    End Sub
End Class

Example Connection String:

<connectionStrings>
    <add name="Northwind_ConnectionString"
      connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI" />
    <add name="Pubs_ConnectionString"
      connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=pubs;Integrated Security=SSPI" />
  </connectionStrings>