Introduction
In
Part 2 of this article series we have discussed how to use Paging with
FormView Control. Now in this article we will discuss how to Edit Data with
FormView Control.
Edit Data with FormView Control
We can edit a database record with the FormView control. For example, we can use
the technique given below to edit any of the records in the BOOK_LIST database
table.
![FormViw3.gif]()
<%@
Page Language="VB"
%>
<!DOCTYPE
html PUBLIC
"-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script
runat="server">
</script>
<html
xmlns="http://www.w3.org/1999/xhtml">
<head
id="Head1"
runat="server">
<style
type="text/css">
html
{
background-color:silver;
}
#content
{
margin:auto;
width:600px;
padding:10px;
background-color:white;
font:14px
Georgia,Serif;
}
a
{
color:blue;
}
</style>
<title></title>
</head>
<body>
<form
id="form1"
runat="server">
<div
id="content">
<asp:FormView
id="frmBooks"
DataSourceID="SqlDataSource1"
DataKeyNames="ID"
AllowPaging="true"
Runat="server">
<ItemTemplate>
<b><u><%#
Eval("TITLE")%></u></b>
<br
/>
<b>Serial
Number:</b>
<%#
Eval("ID")
%>
<br
/>
<b>Author
Name:</b>
<%#
Eval("AUTHOR")%>
<br
/>
<b>Price:</b>
<%#
Eval("PRICE")
%>
<hr
/>
<asp:LinkButton
id="lnkEdit"
Text="Edit
Book"
CommandName="Edit"
Runat="server"
/>
</ItemTemplate>
<EditItemTemplate>
<asp:Label
id="lblTitle"
Text="Book
Title:"
AssociatedControlID="txtTitle"
Runat="server"
/>
<br
/>
<asp:TextBox
id="txtTitle"
Text='<%#
Bind("TITLE") %>'
Runat="server"
/>
<br
/><br
/>
<asp:Label
id="lblAuthor"
Text="Author:"
AssociatedControlID="txtAuthor"
Runat="server"
/>
<br
/>
<asp:TextBox
id="txtAuthor"
Text='<%#
Bind("AUTHOR") %>'
Runat="server"
/>
<br
/><br
/>
<asp:Label
id="lblPrice"
Text="Price:"
AssociatedControlID="txtPrice"
Runat="server"
/>
<br
/>
<asp:TextBox
id="txtPrice"
Text='<%#
Bind("PRICE") %>'
Runat="server"
/>
<br
/><br
/>
<asp:LinkButton
id="lnkUpdate"
Text="Update
Book"
CommandName="Update"
Runat="server"
/>
<asp:LinkButton
id="lnkCancel"
Text="Cancel
Update"
CommandName="Cancel"
Runat="server"
/>
</EditItemTemplate>
</asp:FormView>
<asp:SqlDataSource
ID="SqlDataSource1"
runat="server"
ConnectionString="<%$
ConnectionStrings:DatabaseConnectionString1 %>"
ProviderName="<%$
ConnectionStrings:DatabaseConnectionString1.ProviderName
%>"
SelectCommand="SELECT
[ID], [TITLE], [AUTHOR], [PRICE] FROM [BOOK_LIST]"
UpdateCommand="UPDATE
BOOK_LIST SET ID =@ID, TITLE =@ID, AUTHOR =@AUTHOR, PRICE =@PRICE WHERE ID=@ID">
</asp:SqlDataSource>
</div>
</form>
</body>
</html>
Notice that several things about the FormView control in above example.
First, notice that the FormView control includes a DataKeyNames property that
contains the name of the primary key from the data source. We need to specify a
primary key when editing records.
Next, notice that the FormView control's ItemTemplate includes a LinkButton that
looks like this:
<asp:LinkButton
id="lnkEdit"
Text="Edit
Book"
CommandName="Edit"
Runat="server"
/>
This LinkButton includes a CommandName property with the value Edit. Clicking
the link switches the FormView control into Edit mode. We could use any other
control here that supports the CommandName property such as a Button or
ImageButton control.
Next, notice that the FormView control includes an EditItemTemplate. This
template contains the form for editing the record. Each form field uses a
two-way databinding expression. For example, the form field for editing the book
title looks like this:
<asp:TextBox
id="txtTitle"
Text='<%#
Bind("TITLE") %>'
Runat="server"
/>
The Bind("TITLE") method binds the TITLE column to the Text property of the
TextBox control.
Finally, notice that the EditItemTemplate includes both a LinkButton for
updating the database record and a LinkButton for canceling the update. The
LinkButton for updating the record looks like this:
<asp:LinkButton
id="lnkUpdate"
Text="Update
Book"
CommandName="Update"
Runat="server"
/>
This LinkButton includes a CommandName property, which has the value Update.
When we click this LinkButton, the SQL statement represented by the
SqlDataSource control's UpdateCommand is executed.
Note: Continue in Next Part.
HAVE A GREAT CODING!