Need to delete rows from table if checkboxes are checked for row

Hello. I have a linkbutton that will delete individual rows from my gridview and update the database, however, I want to be able to make multiple selections via the checkboxes which appear on each row, and click just one button to delete all the checked rows. The following is from my aspx page:


<div style="float: right;">
                <asp:Button ID="btnLinkBack" runat="server" Text="Check Backlinks" />
                <asp:Button ID="btnApprove" runat="server" Text="Unhide" />
                <asp:Button ID="btnDisapprove" runat="server" Text="Hide" />
                 <asp:Button ID="btnDelete" runat="server" Text="Delete" />
            <br /><br /><br />
            <asp:GridView ID="gvLink" runat="server" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="false"
                DataKeyNames="AdvLinkID" DataSourceID="objDS" OnDataBinding="gv_DataBinding"
                OnPageIndexChanging="gv_PageIndexChanging" OnRowCommand="gv_RowCommand" OnRowDeleting="gv_RowDeleting"
                PagerSettings-Mode="NumericFirstLast" PagerSettings-PageButtonCount="10" PagerSettings-Position="TopAndBottom"
                PagerStyle-HorizontalAlign="right" Visible="false" Width="100%" PageSize="50">
                    <asp:TemplateField HeaderText="Select" ItemStyle-CssClass="GridHeader">
                            <asp:CheckBox ID="chkSelect" runat="server" />
                    <asp:TemplateField HeaderText="Link" SortExpression="SiteURL">
                            <a href='<%#Container.DataItem("SiteURL")%>' target="_blank">
                                <%#BusinessLogic.WebSite.TrimURL(Container.DataItem("SiteURL"), 40)%>
                            <br />
                            <span class="SiteTitle">
                            <br />
                            <span class="SiteDescription">
                                <%#Container.DataItem("SiteDescription") %>
                    <asp:TemplateField HeaderText="Reciprocal URL" SortExpression="ReciprocalURL" ItemStyle-Width="">
                        <ItemTemplate >
                            <a href="<%#Container.DataItem("ReciprocalURL")%>" target="_blank" title='<%#Container.DataItem("ReciprocalURL")%>'>
                                <%#BusinessLogic.WebSite.BreakReciprocalURL(Container.DataItem("AdvLinkID"), 40)%>                                
                    <asp:TemplateField HeaderText="Back Link" SortExpression="LinkBack" ItemStyle-HorizontalAlign="center">
                            <img src="../images/bullets/<%#CBool(Container.DataItem("LinkBack"))%>.gif" alt="link back status" style="text-align:center;"  id="linkback"/>
                       <asp:TemplateField HeaderText="Last Checked" SortExpression="LastChecked">
          <asp:Label Text='<%# Eval("LastChecked", "{0:d}") %>' runat="server" ID="lblLastChecked" /><br />
          <asp:Button ID="btnEmail" OnClick="EmailWebmaster_Click" runat="server" Text="Email WebMaster" Visible="false" CommandArgument='<%#Container.DataItem("LinkID")%>' Font-Size="XX-Small" /><br />
          <asp:Label Text='Emailed on' runat="server" ID="Label1" Visible="false"/>
           <asp:Label Text='<%# Eval("LastEmailed", "{0:d}") %>' runat="server" ID="lblLastEmailed" Visible="false"/><br />
            <asp:Label Text='Check back in 5 days' runat="server" ID="Label2" Visible="false"/>
         <asp:Label Text='No email available. Contact webmaster through their website.' runat="server" ID="Label3" Visible="false"/>

                            <div class="Highlight">
                                <asp:LinkButton ID="lnkHide" runat="server" CommandArgument='<%#Container.DataItem("AdvLinkID")%>'
                                    OnClick="HideUnHideLink" Text='<%#GetHideText(cbool(Container.DataItem("Approved")))%>'>
                                <a href='adv_links_editbyuser.aspx?lid=<%#Container.DataItem("AdvLinkID")%>'>Edit</a>
                                <br />
                                <asp:LinkButton ID="lnkDelete" runat="server" CommandArgument='<%#Container.DataItem("AdvLinkID")%>'
                                    ForeColor="red" OnClick="DeleteLink" OnClientClick="return confirm('Are your sure to delete this link?')"
            <br />
            <div style="float: left;">
            <div style="float: right;">
                <asp:Button ID="btnLinkBack2" runat="server" Text="Check Backlinks" />
                <asp:Button ID="btnApprove2" runat="server" Text="Unhide" />
                <asp:Button ID="btnDisApprove2" runat="server" Text="Hide" />
                <asp:Button ID="btnDelete2" runat="server" Text="Delete" />
            <br />
            <br />
    <asp:ObjectDataSource ID="objDS" runat="server" DeleteMethod="Delete"
        SelectMethod="GetbyFieldValue" TypeName="BusinessLogic.AdvanceLink">
            <asp:Parameter Name="AdvLinkID" Type="Int32" />
            <asp:Parameter DefaultValue="WebSiteID" Name="field" Type="String" />
            <asp:ControlParameter Name="fieldValue" DefaultValue="0" ControlID="lstAdvanceSites" PropertyName="SelectedValue" Type="String" />
            <asp:Parameter DefaultValue="=" Name="criteria" Type="String" />
            <asp:Parameter DefaultValue="AdvanceCategoryID>0" Name="whereBy" Type="String" />
            <asp:Parameter DefaultValue="LastChecked" ConvertEmptyStringToNull="true" Name="sortBy" Type="String" />
            <asp:Parameter ConvertEmptyStringToNull="true" DefaultValue="" Name="tran" />
1      Protected Sub gv_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs)
2            Dim grid As GridView = CType(sender, GridView)
3            grid.PageIndex = e.NewPageIndex
4            grid.DataBind()
5        End Sub
7        Protected Sub gv_RowDeleting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewDeleteEventArgs)
9        End Sub
10       Protected Sub btnDelete_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDelete.Click
11           Dim gvIDs As String = ""
12           Dim chkBox As Boolean = False
13           'Navigate through each row in the GridView for checkbox items
14           For Each gv As GridViewRow In gvLink.Rows
15               Dim deleteChkBxItem As CheckBox = CType(gv.FindControl("chkSelect"), CheckBox)
16               If deleteChkBxItem.Checked Then
17                   chkBox = True
18                   gvIDs += CType(gv.FindControl("AdvLinkID"), Label).Text.ToString + ","
19               End If
20           Next
21           Dim cn As New SqlConnection(DataFuncs.GetConnectionString)
22           If chkBox Then
23               Try
24                   Dim deleteSQL As String = _
25                  "DELETE from  WHERE employeeid IN (" + _
26                  gvIDs.Substring(0, gvIDs.LastIndexOf(",")) + ")"
27                   Dim cmd As SqlCommand = New SqlCommand(deleteSQL, cn)
28                   cn.Open()
29                   cmd.ExecuteNonQuery()
30                   gvLink.DataBind()
31               Catch Err As SqlException
32                   Response.Write(Err.Message.ToString)
33               Finally
34                   cn.Close()
35               End Try
36           End If
37       End Sub

 I had added the above for btnDelete click from some code I found online.  Can someone help me complete this? The main id is AdvlinkID which identifies the row in the table.

Many thanks. 

Scot King
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1/22/2009 7:49:55 AM 72751 articles. 1 followers. Follow

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 Your on the right track for sure. I modified your code slightly to fire a method every time the check box is true, i think i have read your code correctly
Protected Sub btnDelete_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDelete.Click
        Dim gvIDs As String = ""
        Dim chkBox As Boolean = False
        'Navigate through each row in the GridView for checkbox items
        For Each gv As GridViewRow In gvLink.Rows
            If CType(gv.FindControl("chkSelect"), CheckBox).Checked Then
                'Modified to create a method to run on each Checked=true checkbox
                DeleteItem(CType(gv.FindControl("AdvLinkID"), Label).Text.ToString)
            End If
    End Sub
    'Runs the sql command to delte the employee on each true checkbox, returns a Boolean wether or not complete. 
    'You could change this to a string to send back an error message if you would prefer.
    Private Function DeleteItem(ByVal employee As String) As Boolean
        If String.IsNullOrEmpty(employee) Then
            Return False
        End If
        Dim completed As Boolean = False
        Dim cn As New SqlConnection(DataFuncs.GetConnectionString)
        Dim cmd As SqlCommand = New SqlCommand()
        cmd.Connection = cn
        cmd.CommandType = CommandType.Text
        cmd.CommandText = "DELETE from  WHERE employeeid =@employeeID"
        cmd.Parameters.AddWithValue("@employeeID", employee)
            completed = True
        Catch Err As Exception
            completed = False
        End Try
        Return completed
    End Function



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1/22/2009 10:51:36 AM

The keyval seems to get the integer I need to pass to the delete routine.  It deletes the links from 3 databases. 


Protected Sub btnDelete_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDelete.Click, btnDelete2.Click


    End Sub
    Private Sub Deletelinks()

        Dim grid As GridView = Me.gvLink

        Dim keyVal As String

        For Each itm As GridViewRow In grid.Rows
            keyVal = grid.DataKeys(itm.RowIndex).Value
            If CType(itm.FindControl("chkSelect"), CheckBox).Checked Then

                AdvanceLink.Delete(keyVal, True)

            End If

        Me.lblMsg.Text = "All selected links deleted"

    End Sub

Scot King
SEO Software Tool | Search Engine Optimization

"Get your page rank high"
1/24/2009 9:11:50 PM

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