Asp.Net VB – Listview – ItemCommand – DataKeys – CommandName – SQL

Asp.Net VB - Listview - ItemCommand - DataKeys - CommandName - SQL

Here is a basic Listview that has an ItemCommand and ItemDataBound:

Frontend Code:

<asp:ListView ID="lvAddresses" runat="server" DataKeyNames="AddressID,BillingAddressID,ShippingAddressID">
        <LayoutTemplate>
            <asp:PlaceHolder ID="itemPlaceholder" runat="server"></asp:PlaceHolder>
        </LayoutTemplate>
        <ItemTemplate>
            <table class="noborder address_book" cellpadding="0" cellspacing="0"><tbody>
                <tr>
                    <td colspan="2">
                        <%#DataBinder.Eval(Container.DataItem, "FirstName")%> <%#DataBinder.Eval(Container.DataItem, "LastName")%><br>
                        <%#DataBinder.Eval(Container.DataItem, "Address1")%><br>
                        <%#DataBinder.Eval(Container.DataItem, "City")%>, <%#DataBinder.Eval(Container.DataItem, "State")%>, <%#DataBinder.Eval(Container.DataItem, "Zip")%><br>
                        <%#DataBinder.Eval(Container.DataItem, "Phone")%><br>
                        <span class="caption"><asp:LinkButton ID="lnkMakeDefault_Billing" CommandName="MakeDefault_Billing" runat="server">Click to make Default Billing Address</asp:LinkButton></span>
                        <span class="caption"><asp:Literal ID="litMakeDefault_Billing" runat="server" Text="Default Billing Address"></asp:Literal></span>
                        <br />
                        <span class="caption"><asp:LinkButton ID="lnkMakeDefault_Shipping" CommandName="MakeDefault_Shipping" runat="server">Click to make Default Shipping Address</asp:LinkButton></span>
                        <span class="caption"><asp:Literal ID="litMakeDefault_Shipping" runat="server" Text="Default Shipping Address"></asp:Literal></span>
                    </td>
                </tr>
                <tr>
                    <td>
                        <asp:Button ID="Button1" runat="server" Text="EDIT" CommandName="EDITAddress"/>
                    </td>
                    <td>
                        <asp:Button ID="btnREMOVE" runat="server" Text="REMOVE" CommandName="REMOVEAddress"/>
                    </td>
                </tr>
            </tbody></table>
 
        </ItemTemplate>
    </asp:ListView>

Backend Code:

Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender
 
        FindIt()
 
    End Sub
    Private Sub FindIt()
 
        lblAddresses.Text = ""
 
        Dim sqlDataConnection As System.Data.SqlClient.SqlConnection = CDataAccess.OpenDatabase
        Dim conStr As String = sqlDataConnection.ConnectionString
        sqlDataConnection.Close()
 
        Dim selectCommand As String = "SELECT Address.*, Customer.BillingAddressID, Customer.ShippingAddressID"
        selectCommand &= " FROM Address INNER JOIN Customer ON Address.CustomerID = Customer.CustomerID"
        selectCommand &= " WHERE Address.CustomerID = @CustomerID AND Address.Deleted = 0"
 
        Dim sds As New SqlDataSource()
        sds.ConnectionString = conStr
        sds.SelectParameters.Clear()
 
        sds.SelectParameters.Add("CustomerID", 12345)
        sds.SelectCommand = selectCommand
 
        lvAddresses.DataSource = sds
        lvAddresses.DataBind()
    End Sub
 
    Protected Sub lvAddresses_ItemCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ListViewCommandEventArgs) Handles lvAddresses.ItemCommand
        Dim dataItem As ListViewDataItem = e.Item
        Dim currentDataKey As DataKey = lvAddresses.DataKeys(dataItem.DataItemIndex)
        Dim AddressID As Integer = currentDataKey("AddressID")
        Dim BillingAddressID As Integer = currentDataKey("BillingAddressID")
        Dim ShippingAddressID As Integer = currentDataKey("ShippingAddressID")
 
        'MakeDefault_Billing
        'MakeDefault_Shipping
        'EDITAddress
        'REMOVEAddress
        If String.Equals(e.CommandName, "MakeDefault_Billing") Then
            MakeDefault(AddressID, True)
        ElseIf String.Equals(e.CommandName, "MakeDefault_Shipping") Then
            MakeDefault(AddressID, False)
        ElseIf String.Equals(e.CommandName, "EDITAddress") Then
            EditAddress(AddressID)
        ElseIf String.Equals(e.CommandName, "REMOVEAddress") Then
            RemoveAddress(AddressID)
        End If
    End Sub
 
    Protected Sub lvAddresses_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ListViewItemEventArgs) Handles lvAddresses.ItemDataBound
        Dim dataItem As ListViewDataItem = e.Item
 
        If e.Item.ItemType = ListViewItemType.DataItem Then
            Dim currentDataKey As DataKey = lvAddresses.DataKeys(dataItem.DataItemIndex)
            Dim AddressID As Integer = currentDataKey("AddressID")
            Dim BillingAddressID As Integer = currentDataKey("BillingAddressID")
            Dim ShippingAddressID As Integer = currentDataKey("ShippingAddressID")
            lit = e.Item.FindControl("litMakeDefault_Billing")
            Dim lit2 As Literal = e.Item.FindControl("litMakeDefault_Shipping")
            lnk = e.Item.FindControl("lnkMakeDefault_Billing")
            Dim lnk2 As LinkButton = e.Item.FindControl("lnkMakeDefault_Shipping")
 
            lit.Visible = Not lnk.Visible
        End If
 
    End Sub

.Net – Sending Email with In Memory Attachment

This VB.Net code takes the FileUpload control’s PostedFile and without saving it to the filesystem attaches it to an MailMessage and sends an email.

Advantages:

  • No threading, read/write permissions needed.
  • One line of code.

Front End:

<asp:FileUpload ID="fileUpload" runat="server" />

Code:

Dim m As New MailMessage()
m.Attachments.Add(New Attachment(fileUpload.PostedFile.InputStream, fileUpload.FileName))