Modify controls inside a GridView control

Introduction

Key Concepts

Well like I said the key concepts are DataBinding and gridview's Templates

To understand DataBinding I'll prefer refer to

• http://www.codeproject.com/vb/net/databindingconcepts.asp (Yes you will say that this is Windows DataBinding but its more relevant the concepts than differences)
• http://msdn.microsoft.com/msdnmag/issues/01/03/Cutting/default.aspx (Excelent MSDN's article)
• Book: Professional ASP.NET 1.1 / ISBN: 0-7645-5890-0

Templates are well explain in:

• Book ASP.NET Data Web Controls / ISBN: 0-672-32501-2/ Chapter 1

Problem

I was trying access controls inside a GridView specially when I pressed a button (ButtonField)

I have a page with this gridview:

<P> </P><P><asp:GridView ID="gvFacturas" runat="server" OnRowCommand="gvFacturas_RowCommand" </P><P>AutoGenerateColumns="False" OnRowEditing="gvFacturas_RowEditing" Width="100%"></P><P><Columns></P><P><asp:BoundField DataField="DeteOrder" DataFormatString="{0:d}" HeaderText="Date"</P><P>HtmlEncode="False" /></P><P><asp:TemplateField HeaderText="Description"></P><P><EditItemTemplate></P><P><asp:TextBox ID="txtDescription" runat="server" Text='<%# Bind("Description") %>'></P><P></asp:TextBox></P><P></EditItemTemplate></P><P><ItemTemplate></P><P><asp:Label ID="lblDescription" runat="server" Text='<%# Bind(Description")%>'></P><P></asp:Label></P><P></ItemTemplate></P><P></asp:TemplateField> </P><P><asp:ButtonField ButtonType="Image" HeaderText="Something" </P><P>ImageUrl="~/images/anular.GIF" Text="Button" CommandName="dosomething"></P><P><ItemStyle HorizontalAlign="Center" /></P><P></asp:ButtonField></P><P></Columns></P><P></asp:GridView></P><P>   </P><P> </P>

As you see there are two columns types (BoundField and TemplateField)

This article is oriented to use TemplateFields, a BoundField would convert to TempleateField.

I wish to update lblDescription with another string HOW?

Solutions & Results

The "secret" is RowCommand Event and e.CommandArgument cast.

1. If you wish access and modify the grid but not affect DataSource make this:

if (e.CommandName.Equals("dosomething"))
((Label)gvGrid.Rows[Convert.ToInt32(e.CommandArgument)].FindControl("lblDemo")).Text = "Test!"

2. If you wish modify the data behind gridview use this:

if (e.CommandName.Equals("dosomething")) 
   ((Demo.OrderEntity)Profile.Period.Facturas[gvGrid.Rows[Convert.ToInt32(e.CommandArgument)].DataItemIndex]).Description = "Test!";

Comments?

Thanks

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