GridView how to set behind code to able update rows, or columns?

Hello,
I don't have problem to populate GridView behind code. But, now I need also to edit/update rows/columns, but just don't know where to start.
Actual, I have enable AutoGenerateEditButton, and I thought that asp.net .dll will do the rest job :-(.
I would be please if someone could give me a tip, sample, etc :-)

    Dim connection As New SqlConnection("<conn string>")
                connection.Open()
                Dim da As New SqlDataAdapter("<query>", connection)
                Dim dt As New DataTable()
                da.Fill(dt)
                GridView1.DataSource = dt.DefaultView
                GridView1.AutoGenerateColumns = True
                [b]GridView1.AutoGenerateEditButton = True
[/b]                GridView1.DataBind()

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Thanks in advance for help!

dejandejanovicAsked: 2013-11-10

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LVL 11

SAMIR BHOGAYTAFreelancer and IT ConsultantCommented: 2013-11-10

hi..
Here is the markup you need to create an EditItemTemplate within your TemplateField

<asp:GridView ID="GridView2" runat="server" Visible="False" AutoGenerateColumns="false"
ShowFooter="True"
AutoGenerateDeleteButton="True" AutoGenerateEditButton="True">
<Columns>
<asp:BoundField DataField="RowNumber" HeaderText="Row Number" />
<asp:TemplateField HeaderText="Action Item">
<ItemTemplate>
<asp:TextBox ID="TextBox1" Width="500px" TextMode="MultiLine" runat="server"></asp:TextBox>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox id="EditActionItemTextBox" runat="server" Width="500px" TextMode="MultiLine"></asp:TextBox>
</EditItemTemplate>
<FooterTemplate>
<asp:Button ID="ButtonAdd" OnClick="ButtonAdd_Click" runat="server" Text="Add New Row" />
</FooterTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>

Now in your code-behind where you are updating your data table, do this

'Update the values.
Dim row = GridView2.Rows(e.RowIndex)
dt.Rows(row.DataItemIndex)("RowNumber") = (CType((row.Cells(1).Controls(0)), TextBox)).Text
dt.Rows(row.DataItemIndex)("Action Item") = (CType((row.FindControl("EditActionItemTextBox")), TextBox).Text)

Note: In your <ItemTemplate> you may want to consider making the control read-only so that your users know they cannot change the value, usually when a user sees a text box they think they can edit the content, but it completely makes sense to have an editable text box in edit mode of your grid view. To change the the <ItemTemplate> text box to read-only, just add ReadOnly="True", like this

<ItemTemplate>
<asp:TextBox ID="TextBox1" Width="500px" TextMode="MultiLine"
runat="server" ReadOnly="True"></asp:TextBox>
</ItemTemplate>

Depending upon the browser, the control will have a slight gray tinge to it. The user will be able to click on the text, but will not be able to change the text.

LVL 12

duttcomCommented: 2013-11-10

Try adding a commandfield column in your gridview to show the buttons. The example below shows the commandfield in the first column and shows the Edit and Delete buttons, but you could put it last if you want.

<Columns>
<asp:CommandField ShowDeleteButton="True" ShowEditButton="True" />
<asp:BoundField DataField="Field1" HeaderText="Field header text" ReadOnly="True" SortExpression="Field1" />

Etc...

dejandejanovicAuthor Commented: 2013-11-11

Hm,
well my actual goal is to populate gridview by different tables, different table structure. That why I'm looking to design gridview from code behind.
Like:
- first populate gridview with table columns A, B, C, Edit column
- enable edit column with update query (also behind code)
- delete query is no needed

That would not be a problem, but my main problem is that I cannot have a STATIC GridView as tables have different columns.

For edit:

GridView1.EditIndex = e.NewEditIndex;

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For cancel:

GridView1.EditIndex = -1

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But, now I also need to populate row on edit, so selection query >> and update row with update query.

Just in case if you have any samples, but if not then we can close this case.

Thanks.