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Creating an editable datagrid in asp.net / vb.net, Internet Explorer 7.0

Posted on 2007-11-28
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Last Modified: 2013-11-26
Greetings,

I know at the end of this I will be kicking myself, but right now I am having a brain fart and cannot for the life of me remember how to set this up.

I am trying to create an editable datagrid and here is the datagrid source:

<asp:datagrid id="dgItemsReturn" runat="server" showfooter="true" AutoGenerateColumns="false"
                                    Width="80%" HeaderStyle-BackColor="#3399FF" HeaderStyle-CssClass="btextwhite" HeaderStyle-VerticalAlign="bottom"
                                    HeaderStyle-HorizontalAlign="center" FooterStyle-BackColor="#3399FF" ItemStyle-BackColor="#FFFFCC" ItemStyle-CssClass="dtltext"
                                    ItemStyle-VerticalAlign="top" AlternatingItemStyle-BackColor="#FFFFFF" CellPadding="1" BorderColor="#CCCCCC"
                                    BorderWidth="1">
                                    <Columns>
                                          <asp:TemplateColumn HeaderText="Id">
                                                <HeaderStyle Font-Bold="True" HorizontalAlign="Center" VerticalAlign="Top"></HeaderStyle>
                                                <ItemTemplate>
                                                      <asp:label id="lblMerchReturnItemRecId" runat="server" cssclass="rtext"></asp:label>
                                                      <asp:TextBox id="tbxRecStatus" visible="false" runat="server"></asp:TextBox>
                                                </ItemTemplate>
                                          </asp:TemplateColumn>
                                          <asp:TemplateColumn HeaderText="BV Item">
                                                <HeaderStyle Font-Bold="True" HorizontalAlign="Center" VerticalAlign="Top"></HeaderStyle>
                                                <ItemTemplate>
                                                      <asp:TextBox id="tbxBvItem" cssclass="rtext" runat="server"></asp:TextBox>
                                                </ItemTemplate>
                                                <footertemplate>
                                                      <asp:TextBox id="tbxNewBvItem" cssclass="rtext" runat="server"></asp:TextBox>
                                                </footertemplate>
                                          </asp:TemplateColumn>
                                          <asp:TemplateColumn HeaderText="Description">
                                                <HeaderStyle Font-Bold="True" HorizontalAlign="Center" VerticalAlign="Top"></HeaderStyle>
                                                <ItemTemplate>
                                                      <asp:TextBox ID="tbxBvItemDesc" cssclass="rtext" Runat="server"></asp:TextBox>
                                                </ItemTemplate>
                                                <footertemplate>
                                                      <asp:TextBox id="tbxNewBvItemDesc" cssclass="rtext" runat="server"></asp:TextBox>
                                                </footertemplate>
                                          </asp:TemplateColumn>
                                          <asp:TemplateColumn HeaderText="Qty">
                                                <HeaderStyle Font-Bold="True" HorizontalAlign="Center" VerticalAlign="Top"></HeaderStyle>
                                                <ItemTemplate>
                                                      <asp:TextBox ID="tbxBvItemQty" cssclass="rtext" Runat="server"></asp:TextBox>
                                                </ItemTemplate>
                                                <footertemplate>
                                                      <asp:TextBox id="tbxNewBvItemQty" cssclass="rtext" runat="server"></asp:TextBox>
                                                </footertemplate>
                                          </asp:TemplateColumn>
                                          <asp:TemplateColumn HeaderText="Unit Price">
                                                <HeaderStyle Font-Bold="True" HorizontalAlign="Center" VerticalAlign="Top"></HeaderStyle>
                                                <ItemTemplate>
                                                      <asp:TextBox ID="tbxBvItemUnitPrice" cssclass="rtext" Runat="server"></asp:TextBox>
                                                </ItemTemplate>
                                                <footertemplate>
                                                      <asp:TextBox id="tbxNewBvItemUnitPrice" cssclass="rtext" runat="server"></asp:TextBox>
                                                </footertemplate>
                                          </asp:TemplateColumn>
                                          <asp:TemplateColumn HeaderText="Total">
                                                <HeaderStyle Font-Bold="True" HorizontalAlign="Center" VerticalAlign="Top"></HeaderStyle>
                                                <ItemTemplate>
                                                      <asp:label id="lblBvItemTotalCost" runat="server" cssclass="rtext"></asp:label>
                                                </ItemTemplate>
                                                <footertemplate>
                                                      <asp:LinkButton Runat="server" Text="Add" CommandName="AddItem" ID="lkbAddItem" NAME="Linkbutton1"></asp:LinkButton>
                                                </footertemplate>
                                          </asp:TemplateColumn>
                                    </Columns>
                              </asp:datagrid>

I plan to populate this datagrid from a database table (sql server 2000) and have the itemdatabound event all set up when the return resultset is bound to the datagrid. My problem is that if there is no items in the resultset, how do I get the get the grid to show up with the footer templates, so that the user can enter in new items.

Like I said at the start, probably will kick myself once I see the solution, but in the mean time if anyone can help out here, I would appreciate it. Thanks.

JD
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Question by:JDEE8297
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Expert Comment

by:cmhunty
Comment Utility
'Fraid the only reason you'd be kicking yourself is because of the nasty way you have to do it considering how simple your request is.

I had exactly the same problem and I'll point you to http://www.codeproject.com/useritems/Fix_empty_GridView_issue.asp which should solve your problem.

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Author Comment

by:JDEE8297
Comment Utility
I think I am going to need a bigger foot ;)
I will try this and see if it does the job for me, I don't know c# very well, but what I am able to figure out what the code is doing. So it is not too bad. Thanks again. If this works, then I will let you know.


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Author Comment

by:JDEE8297
Comment Utility
actually, I guess I am not sure how this can work, and it is probably like of C# knowledge that is hurting me right now.

If you don't have anything assigned to the datagrid, how does it create the data columns?
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LVL 11

Expert Comment

by:cmhunty
Comment Utility
I'll have a look at converting to VB.NET for you. As I said, I've done this before but was at my old job so don't have the code to hand.

Basically, this is what happens:
After you've bound the gridview.
Check the amount of rows in gridview
If 0, copy the source of the gridview to a datatable
Adds an empty row to datatable
Rebind the gridview
Hide the empty row

I'll get back to your shortly


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Accepted Solution

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cmhunty earned 125 total points
Comment Utility
Are you using ASP.NET 2.0? If so, I think you'll need to convert your datagrid to a gridview control........
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Author Closing Comment

by:JDEE8297
Comment Utility
I eventually did find a way to convert the c# to vb.net, this link is really helpful incase you ever need to pass it onto someone.

http://labs.developerfusion.co.uk/convert/csharp-to-vb.aspx

I got it to work, and I did not have to kick my self as I thought I would, so thanks again for your help on this one.

For the record, was using datagrid with asp.net 1.1 (long story short, just started here recently at my current job and they are still in the land of 1.1, which is funny considering my previous job was the land of 2.0).

Thanks again for your help.
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Author Comment

by:JDEE8297
Comment Utility
thanks again, got it to work.

found this link to convert c# to vb.net

http://labs.developerfusion.co.uk/convert/csharp-to-vb.aspx
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Expert Comment

by:cmhunty
Comment Utility
Good stuff - I've just converted it so for anyone else that may be interested:

    Private Sub FixEmptyGridView(ByVal gv As GridView)
        If gv.Rows.Count = 0 And gv.DataSource Is DBNull.Value = False Then
            Dim dt As DataTable
            If gv.DataSource.GetType.Name = "DataSet" Then
                dt = CType(gv.DataSource, DataSet).Tables(0)
            ElseIf gv.DataSource.GetType.Name = "DataTable" Then
                dt = CType(gv.DataSource, DataTable)
            End If
            If dt Is Nothing Then
                Return
            End If
            dt.Rows.Add(dt.NewRow)
            gv.DataSource = dt
            gv.DataBind()
            gv.Rows(0).Visible = False
            gv.Rows(0).Controls.Clear()
        End If
    End Sub
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